godot-docs/classes/class_audioserver.rst

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.. DO NOT EDIT THIS FILE, but the AudioServer.xml source instead.
.. The source is found in doc/classes or modules/<name>/doc_classes.

.. _class_AudioServer:

AudioServer
===========

**Inherits:** :ref:`Object<class_Object>`

Server interface for low-level audio access.

Description
-----------

AudioServer is a low-level server interface for audio access. It is in charge of creating sample data (playable audio) as well as its playback via a voice interface.

Tutorials
---------

- :doc:`../tutorials/audio/audio_buses`

Properties
----------

+-----------------------------+------------------------------------------------------------------------+---------------+
| :ref:`int<class_int>`       | :ref:`bus_count<class_AudioServer_property_bus_count>`                 | ``1``         |
+-----------------------------+------------------------------------------------------------------------+---------------+
| :ref:`String<class_String>` | :ref:`device<class_AudioServer_property_device>`                       | ``"Default"`` |
+-----------------------------+------------------------------------------------------------------------+---------------+
| :ref:`float<class_float>`   | :ref:`global_rate_scale<class_AudioServer_property_global_rate_scale>` | ``1.0``       |
+-----------------------------+------------------------------------------------------------------------+---------------+

Methods
-------

+-------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| void                                                  | :ref:`add_bus<class_AudioServer_method_add_bus>` **(** :ref:`int<class_int>` at_position=-1 **)**                                                                                             |
+-------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| void                                                  | :ref:`add_bus_effect<class_AudioServer_method_add_bus_effect>` **(** :ref:`int<class_int>` bus_idx, :ref:`AudioEffect<class_AudioEffect>` effect, :ref:`int<class_int>` at_position=-1 **)**  |
+-------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| :ref:`String<class_String>`                           | :ref:`capture_get_device<class_AudioServer_method_capture_get_device>` **(** **)**                                                                                                            |
+-------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| :ref:`Array<class_Array>`                             | :ref:`capture_get_device_list<class_AudioServer_method_capture_get_device_list>` **(** **)**                                                                                                  |
+-------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| void                                                  | :ref:`capture_set_device<class_AudioServer_method_capture_set_device>` **(** :ref:`String<class_String>` name **)**                                                                           |
+-------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| :ref:`AudioBusLayout<class_AudioBusLayout>`           | :ref:`generate_bus_layout<class_AudioServer_method_generate_bus_layout>` **(** **)** const                                                                                                    |
+-------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| :ref:`int<class_int>`                                 | :ref:`get_bus_channels<class_AudioServer_method_get_bus_channels>` **(** :ref:`int<class_int>` bus_idx **)** const                                                                            |
+-------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| :ref:`AudioEffect<class_AudioEffect>`                 | :ref:`get_bus_effect<class_AudioServer_method_get_bus_effect>` **(** :ref:`int<class_int>` bus_idx, :ref:`int<class_int>` effect_idx **)**                                                    |
+-------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| :ref:`int<class_int>`                                 | :ref:`get_bus_effect_count<class_AudioServer_method_get_bus_effect_count>` **(** :ref:`int<class_int>` bus_idx **)**                                                                          |
+-------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| :ref:`AudioEffectInstance<class_AudioEffectInstance>` | :ref:`get_bus_effect_instance<class_AudioServer_method_get_bus_effect_instance>` **(** :ref:`int<class_int>` bus_idx, :ref:`int<class_int>` effect_idx, :ref:`int<class_int>` channel=0 **)** |
+-------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| :ref:`int<class_int>`                                 | :ref:`get_bus_index<class_AudioServer_method_get_bus_index>` **(** :ref:`String<class_String>` bus_name **)** const                                                                           |
+-------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| :ref:`String<class_String>`                           | :ref:`get_bus_name<class_AudioServer_method_get_bus_name>` **(** :ref:`int<class_int>` bus_idx **)** const                                                                                    |
+-------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| :ref:`float<class_float>`                             | :ref:`get_bus_peak_volume_left_db<class_AudioServer_method_get_bus_peak_volume_left_db>` **(** :ref:`int<class_int>` bus_idx, :ref:`int<class_int>` channel **)** const                       |
+-------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| :ref:`float<class_float>`                             | :ref:`get_bus_peak_volume_right_db<class_AudioServer_method_get_bus_peak_volume_right_db>` **(** :ref:`int<class_int>` bus_idx, :ref:`int<class_int>` channel **)** const                     |
+-------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| :ref:`String<class_String>`                           | :ref:`get_bus_send<class_AudioServer_method_get_bus_send>` **(** :ref:`int<class_int>` bus_idx **)** const                                                                                    |
+-------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| :ref:`float<class_float>`                             | :ref:`get_bus_volume_db<class_AudioServer_method_get_bus_volume_db>` **(** :ref:`int<class_int>` bus_idx **)** const                                                                          |
+-------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| :ref:`Array<class_Array>`                             | :ref:`get_device_list<class_AudioServer_method_get_device_list>` **(** **)**                                                                                                                  |
+-------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| :ref:`float<class_float>`                             | :ref:`get_mix_rate<class_AudioServer_method_get_mix_rate>` **(** **)** const                                                                                                                  |
+-------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| :ref:`float<class_float>`                             | :ref:`get_output_latency<class_AudioServer_method_get_output_latency>` **(** **)** const                                                                                                      |
+-------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| :ref:`SpeakerMode<enum_AudioServer_SpeakerMode>`      | :ref:`get_speaker_mode<class_AudioServer_method_get_speaker_mode>` **(** **)** const                                                                                                          |
+-------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| :ref:`float<class_float>`                             | :ref:`get_time_since_last_mix<class_AudioServer_method_get_time_since_last_mix>` **(** **)** const                                                                                            |
+-------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| :ref:`float<class_float>`                             | :ref:`get_time_to_next_mix<class_AudioServer_method_get_time_to_next_mix>` **(** **)** const                                                                                                  |
+-------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| :ref:`bool<class_bool>`                               | :ref:`is_bus_bypassing_effects<class_AudioServer_method_is_bus_bypassing_effects>` **(** :ref:`int<class_int>` bus_idx **)** const                                                            |
+-------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| :ref:`bool<class_bool>`                               | :ref:`is_bus_effect_enabled<class_AudioServer_method_is_bus_effect_enabled>` **(** :ref:`int<class_int>` bus_idx, :ref:`int<class_int>` effect_idx **)** const                                |
+-------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| :ref:`bool<class_bool>`                               | :ref:`is_bus_mute<class_AudioServer_method_is_bus_mute>` **(** :ref:`int<class_int>` bus_idx **)** const                                                                                      |
+-------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| :ref:`bool<class_bool>`                               | :ref:`is_bus_solo<class_AudioServer_method_is_bus_solo>` **(** :ref:`int<class_int>` bus_idx **)** const                                                                                      |
+-------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| void                                                  | :ref:`lock<class_AudioServer_method_lock>` **(** **)**                                                                                                                                        |
+-------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| void                                                  | :ref:`move_bus<class_AudioServer_method_move_bus>` **(** :ref:`int<class_int>` index, :ref:`int<class_int>` to_index **)**                                                                    |
+-------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| void                                                  | :ref:`remove_bus<class_AudioServer_method_remove_bus>` **(** :ref:`int<class_int>` index **)**                                                                                                |
+-------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| void                                                  | :ref:`remove_bus_effect<class_AudioServer_method_remove_bus_effect>` **(** :ref:`int<class_int>` bus_idx, :ref:`int<class_int>` effect_idx **)**                                              |
+-------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| void                                                  | :ref:`set_bus_bypass_effects<class_AudioServer_method_set_bus_bypass_effects>` **(** :ref:`int<class_int>` bus_idx, :ref:`bool<class_bool>` enable **)**                                      |
+-------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| void                                                  | :ref:`set_bus_effect_enabled<class_AudioServer_method_set_bus_effect_enabled>` **(** :ref:`int<class_int>` bus_idx, :ref:`int<class_int>` effect_idx, :ref:`bool<class_bool>` enabled **)**   |
+-------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| void                                                  | :ref:`set_bus_layout<class_AudioServer_method_set_bus_layout>` **(** :ref:`AudioBusLayout<class_AudioBusLayout>` bus_layout **)**                                                             |
+-------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| void                                                  | :ref:`set_bus_mute<class_AudioServer_method_set_bus_mute>` **(** :ref:`int<class_int>` bus_idx, :ref:`bool<class_bool>` enable **)**                                                          |
+-------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| void                                                  | :ref:`set_bus_name<class_AudioServer_method_set_bus_name>` **(** :ref:`int<class_int>` bus_idx, :ref:`String<class_String>` name **)**                                                        |
+-------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| void                                                  | :ref:`set_bus_send<class_AudioServer_method_set_bus_send>` **(** :ref:`int<class_int>` bus_idx, :ref:`String<class_String>` send **)**                                                        |
+-------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| void                                                  | :ref:`set_bus_solo<class_AudioServer_method_set_bus_solo>` **(** :ref:`int<class_int>` bus_idx, :ref:`bool<class_bool>` enable **)**                                                          |
+-------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| void                                                  | :ref:`set_bus_volume_db<class_AudioServer_method_set_bus_volume_db>` **(** :ref:`int<class_int>` bus_idx, :ref:`float<class_float>` volume_db **)**                                           |
+-------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| void                                                  | :ref:`swap_bus_effects<class_AudioServer_method_swap_bus_effects>` **(** :ref:`int<class_int>` bus_idx, :ref:`int<class_int>` effect_idx, :ref:`int<class_int>` by_effect_idx **)**           |
+-------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| void                                                  | :ref:`unlock<class_AudioServer_method_unlock>` **(** **)**                                                                                                                                    |
+-------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+

Signals
-------

.. _class_AudioServer_signal_bus_layout_changed:

- **bus_layout_changed** **(** **)**

Emitted when the :ref:`AudioBusLayout<class_AudioBusLayout>` changes.

Enumerations
------------

.. _enum_AudioServer_SpeakerMode:

.. _class_AudioServer_constant_SPEAKER_MODE_STEREO:

.. _class_AudioServer_constant_SPEAKER_SURROUND_31:

.. _class_AudioServer_constant_SPEAKER_SURROUND_51:

.. _class_AudioServer_constant_SPEAKER_SURROUND_71:

enum **SpeakerMode**:

- **SPEAKER_MODE_STEREO** = **0** --- Two or fewer speakers were detected.

- **SPEAKER_SURROUND_31** = **1** --- A 3.1 channel surround setup was detected.

- **SPEAKER_SURROUND_51** = **2** --- A 5.1 channel surround setup was  detected.

- **SPEAKER_SURROUND_71** = **3** --- A 7.1 channel surround setup was  detected.

Property Descriptions
---------------------

.. _class_AudioServer_property_bus_count:

- :ref:`int<class_int>` **bus_count**

+-----------+----------------------+
| *Default* | ``1``                |
+-----------+----------------------+
| *Setter*  | set_bus_count(value) |
+-----------+----------------------+
| *Getter*  | get_bus_count()      |
+-----------+----------------------+

Number of available audio buses.

----

.. _class_AudioServer_property_device:

- :ref:`String<class_String>` **device**

+-----------+-------------------+
| *Default* | ``"Default"``     |
+-----------+-------------------+
| *Setter*  | set_device(value) |
+-----------+-------------------+
| *Getter*  | get_device()      |
+-----------+-------------------+

Name of the current device for audio output (see :ref:`get_device_list<class_AudioServer_method_get_device_list>`).

----

.. _class_AudioServer_property_global_rate_scale:

- :ref:`float<class_float>` **global_rate_scale**

+-----------+------------------------------+
| *Default* | ``1.0``                      |
+-----------+------------------------------+
| *Setter*  | set_global_rate_scale(value) |
+-----------+------------------------------+
| *Getter*  | get_global_rate_scale()      |
+-----------+------------------------------+

Scales the rate at which audio is played (i.e. setting it to ``0.5`` will make the audio be played twice as fast).

Method Descriptions
-------------------

.. _class_AudioServer_method_add_bus:

- void **add_bus** **(** :ref:`int<class_int>` at_position=-1 **)**

Adds a bus at ``at_position``.

----

.. _class_AudioServer_method_add_bus_effect:

- void **add_bus_effect** **(** :ref:`int<class_int>` bus_idx, :ref:`AudioEffect<class_AudioEffect>` effect, :ref:`int<class_int>` at_position=-1 **)**

Adds an :ref:`AudioEffect<class_AudioEffect>` effect to the bus ``bus_idx`` at ``at_position``.

----

.. _class_AudioServer_method_capture_get_device:

- :ref:`String<class_String>` **capture_get_device** **(** **)**

Name of the current device for audio input (see :ref:`capture_get_device_list<class_AudioServer_method_capture_get_device_list>`).

----

.. _class_AudioServer_method_capture_get_device_list:

- :ref:`Array<class_Array>` **capture_get_device_list** **(** **)**

Returns the names of all audio input devices detected on the system.

----

.. _class_AudioServer_method_capture_set_device:

- void **capture_set_device** **(** :ref:`String<class_String>` name **)**

----

.. _class_AudioServer_method_generate_bus_layout:

- :ref:`AudioBusLayout<class_AudioBusLayout>` **generate_bus_layout** **(** **)** const

Generates an :ref:`AudioBusLayout<class_AudioBusLayout>` using the available buses and effects.

----

.. _class_AudioServer_method_get_bus_channels:

- :ref:`int<class_int>` **get_bus_channels** **(** :ref:`int<class_int>` bus_idx **)** const

Returns the amount of channels of the bus at index ``bus_idx``.

----

.. _class_AudioServer_method_get_bus_effect:

- :ref:`AudioEffect<class_AudioEffect>` **get_bus_effect** **(** :ref:`int<class_int>` bus_idx, :ref:`int<class_int>` effect_idx **)**

Returns the :ref:`AudioEffect<class_AudioEffect>` at position ``effect_idx`` in bus ``bus_idx``.

----

.. _class_AudioServer_method_get_bus_effect_count:

- :ref:`int<class_int>` **get_bus_effect_count** **(** :ref:`int<class_int>` bus_idx **)**

Returns the number of effects on the bus at ``bus_idx``.

----

.. _class_AudioServer_method_get_bus_effect_instance:

- :ref:`AudioEffectInstance<class_AudioEffectInstance>` **get_bus_effect_instance** **(** :ref:`int<class_int>` bus_idx, :ref:`int<class_int>` effect_idx, :ref:`int<class_int>` channel=0 **)**

----

.. _class_AudioServer_method_get_bus_index:

- :ref:`int<class_int>` **get_bus_index** **(** :ref:`String<class_String>` bus_name **)** const

Returns the index of the bus with the name ``bus_name``.

----

.. _class_AudioServer_method_get_bus_name:

- :ref:`String<class_String>` **get_bus_name** **(** :ref:`int<class_int>` bus_idx **)** const

Returns the name of the bus with the index ``bus_idx``.

----

.. _class_AudioServer_method_get_bus_peak_volume_left_db:

- :ref:`float<class_float>` **get_bus_peak_volume_left_db** **(** :ref:`int<class_int>` bus_idx, :ref:`int<class_int>` channel **)** const

Returns the peak volume of the left speaker at bus index ``bus_idx`` and channel index ``channel``.

----

.. _class_AudioServer_method_get_bus_peak_volume_right_db:

- :ref:`float<class_float>` **get_bus_peak_volume_right_db** **(** :ref:`int<class_int>` bus_idx, :ref:`int<class_int>` channel **)** const

Returns the peak volume of the right speaker at bus index ``bus_idx`` and channel index ``channel``.

----

.. _class_AudioServer_method_get_bus_send:

- :ref:`String<class_String>` **get_bus_send** **(** :ref:`int<class_int>` bus_idx **)** const

Returns the name of the bus that the bus at index ``bus_idx`` sends to.

----

.. _class_AudioServer_method_get_bus_volume_db:

- :ref:`float<class_float>` **get_bus_volume_db** **(** :ref:`int<class_int>` bus_idx **)** const

Returns the volume of the bus at index ``bus_idx`` in dB.

----

.. _class_AudioServer_method_get_device_list:

- :ref:`Array<class_Array>` **get_device_list** **(** **)**

Returns the names of all audio devices detected on the system.

----

.. _class_AudioServer_method_get_mix_rate:

- :ref:`float<class_float>` **get_mix_rate** **(** **)** const

Returns the sample rate at the output of the ``AudioServer``.

----

.. _class_AudioServer_method_get_output_latency:

- :ref:`float<class_float>` **get_output_latency** **(** **)** const

Returns the audio driver's output latency.

----

.. _class_AudioServer_method_get_speaker_mode:

- :ref:`SpeakerMode<enum_AudioServer_SpeakerMode>` **get_speaker_mode** **(** **)** const

Returns the speaker configuration.

----

.. _class_AudioServer_method_get_time_since_last_mix:

- :ref:`float<class_float>` **get_time_since_last_mix** **(** **)** const

----

.. _class_AudioServer_method_get_time_to_next_mix:

- :ref:`float<class_float>` **get_time_to_next_mix** **(** **)** const

----

.. _class_AudioServer_method_is_bus_bypassing_effects:

- :ref:`bool<class_bool>` **is_bus_bypassing_effects** **(** :ref:`int<class_int>` bus_idx **)** const

If ``true``, the bus at index ``bus_idx`` is bypassing effects.

----

.. _class_AudioServer_method_is_bus_effect_enabled:

- :ref:`bool<class_bool>` **is_bus_effect_enabled** **(** :ref:`int<class_int>` bus_idx, :ref:`int<class_int>` effect_idx **)** const

If ``true``, the effect at index ``effect_idx`` on the bus at index ``bus_idx`` is enabled.

----

.. _class_AudioServer_method_is_bus_mute:

- :ref:`bool<class_bool>` **is_bus_mute** **(** :ref:`int<class_int>` bus_idx **)** const

If ``true``, the bus at index ``bus_idx`` is muted.

----

.. _class_AudioServer_method_is_bus_solo:

- :ref:`bool<class_bool>` **is_bus_solo** **(** :ref:`int<class_int>` bus_idx **)** const

If ``true``, the bus at index ``bus_idx`` is in solo mode.

----

.. _class_AudioServer_method_lock:

- void **lock** **(** **)**

Locks the audio driver's main loop. Remember to unlock it afterwards.

----

.. _class_AudioServer_method_move_bus:

- void **move_bus** **(** :ref:`int<class_int>` index, :ref:`int<class_int>` to_index **)**

Moves the bus from index ``index`` to index ``to_index``.

----

.. _class_AudioServer_method_remove_bus:

- void **remove_bus** **(** :ref:`int<class_int>` index **)**

Removes the bus at index ``index``.

----

.. _class_AudioServer_method_remove_bus_effect:

- void **remove_bus_effect** **(** :ref:`int<class_int>` bus_idx, :ref:`int<class_int>` effect_idx **)**

Removes the effect at index ``effect_idx`` from the bus at index ``bus_idx``.

----

.. _class_AudioServer_method_set_bus_bypass_effects:

- void **set_bus_bypass_effects** **(** :ref:`int<class_int>` bus_idx, :ref:`bool<class_bool>` enable **)**

If ``true``, the bus at index ``bus_idx`` is bypassing effects.

----

.. _class_AudioServer_method_set_bus_effect_enabled:

- void **set_bus_effect_enabled** **(** :ref:`int<class_int>` bus_idx, :ref:`int<class_int>` effect_idx, :ref:`bool<class_bool>` enabled **)**

If ``true``, the effect at index ``effect_idx`` on the bus at index ``bus_idx`` is enabled.

----

.. _class_AudioServer_method_set_bus_layout:

- void **set_bus_layout** **(** :ref:`AudioBusLayout<class_AudioBusLayout>` bus_layout **)**

Overwrites the currently used :ref:`AudioBusLayout<class_AudioBusLayout>`.

----

.. _class_AudioServer_method_set_bus_mute:

- void **set_bus_mute** **(** :ref:`int<class_int>` bus_idx, :ref:`bool<class_bool>` enable **)**

If ``true``, the bus at index ``bus_idx`` is muted.

----

.. _class_AudioServer_method_set_bus_name:

- void **set_bus_name** **(** :ref:`int<class_int>` bus_idx, :ref:`String<class_String>` name **)**

Sets the name of the bus at index ``bus_idx`` to ``name``.

----

.. _class_AudioServer_method_set_bus_send:

- void **set_bus_send** **(** :ref:`int<class_int>` bus_idx, :ref:`String<class_String>` send **)**

Connects the output of the bus at ``bus_idx`` to the bus named ``send``.

----

.. _class_AudioServer_method_set_bus_solo:

- void **set_bus_solo** **(** :ref:`int<class_int>` bus_idx, :ref:`bool<class_bool>` enable **)**

If ``true``, the bus at index ``bus_idx`` is in solo mode.

----

.. _class_AudioServer_method_set_bus_volume_db:

- void **set_bus_volume_db** **(** :ref:`int<class_int>` bus_idx, :ref:`float<class_float>` volume_db **)**

Sets the volume of the bus at index ``bus_idx`` to ``volume_db``.

----

.. _class_AudioServer_method_swap_bus_effects:

- void **swap_bus_effects** **(** :ref:`int<class_int>` bus_idx, :ref:`int<class_int>` effect_idx, :ref:`int<class_int>` by_effect_idx **)**

Swaps the position of two effects in bus ``bus_idx``.

----

.. _class_AudioServer_method_unlock:

- void **unlock** **(** **)**

Unlocks the audio driver's main loop. (After locking it, you should always unlock it.)