This package offers a Python interface for the Voicemeeter Remote C API.

For an outline of past/future changes refer to: CHANGELOG

• Basic 1.1.1.1
• Banana 2.1.1.1
• Potato 3.1.1.1

• Voicemeeter
• Python 3.10 or greater

pip install voicemeeter-api

Simplest use case, use a context manager to request a Remote class of a kind.

Login and logout are handled for you in this scenario.

import voicemeeterlib


class ManyThings:
    def __init__(self, vm):
        self.vm = vm

    def things(self):
        self.vm.strip[0].label = "podmic"
        self.vm.strip[0].mute = True
        print(
            f"strip 0 ({self.vm.strip[0].label}) mute has been set to {self.vm.strip[0].mute}"
        )

    def other_things(self):
        self.vm.bus[3].gain = -6.3
        self.vm.bus[4].eq.on = True
        info = (
            f"bus 3 gain has been set to {self.vm.bus[3].gain}",
            f"bus 4 eq has been set to {self.vm.bus[4].eq.on}",
        )
        print("\n".join(info))


def main():
    KIND_ID = "banana"

    with voicemeeterlib.api(KIND_ID) as vm:
        do = ManyThings(vm)
        do.things()
        do.other_things()

        # set many parameters at once
        vm.apply(
            {
                "strip-2": {"A1": True, "B1": True, "gain": -6.0},
                "bus-2": {"mute": True, "eq": {"on": True}},
                "button-0": {"state": True},
                "vban-in-0": {"on": True},
                "vban-out-1": {"name": "streamname"},
            }
        )


if __name__ == "__main__":
    main()

Otherwise you must remember to call vm.login(), vm.logout() at the start/end of your code.

Pass the kind of Voicemeeter as an argument. KIND_ID may be:

• basic
• banana
• potato

The following properties are available.

• mono: boolean
• solo: boolean
• mute: boolean
• gain: float, from -60.0 to 12.0
• audibility: float, from 0.0 to 10.0
• limit: int, from -40 to 12
• A1 - A5, B1 - B3: boolean
• label: string
• mc: boolean
• k: int, from 0 to 4
• bass: float, from -12.0 to 12.0
• mid: float, from -12.0 to 12.0
• treble: float, from -12.0 to 12.0
• reverb: float, from 0.0 to 10.0
• delay: float, from 0.0 to 10.0
• fx1: float, from 0.0 to 10.0
• fx2: float, from 0.0 to 10.0
• pan_x: float, from -0.5 to 0.5
• pan_y: float, from 0.0 to 1.0
• color_x: float, from -0.5 to 0.5
• color_y: float, from 0.0 to 1.0
• fx_x: float, from -0.5 to 0.5
• fx_y: float, from 0.0 to 1.0
• postreverb: boolean
• postdelay: boolean
• postfx1: boolean
• postfx2: boolean

example:

vm.strip[3].gain = 3.7
print(vm.strip[0].label)

The following methods are available.

• appgain(name, value): string, float, from 0.0 to 1.0

Set the gain in db by value for the app matching name.

• appmute(name, value): string, bool

Set mute state as value for the app matching name.

example:

vm.strip[5].appmute("Spotify", True)
vm.strip[5].appgain("Spotify", 0.5)

The following properties are available.

• knob: float, from 0.0 to 10.0
• gainin: float, from -24.0 to 24.0
• ratio: float, from 1.0 to 8.0
• threshold: float, from -40.0 to -3.0
• attack: float, from 0.0 to 200.0
• release: float, from 0.0 to 5000.0
• knee: float, from 0.0 to 1.0
• gainout: float, from -24.0 to 24.0
• makeup: boolean

example:

print(vm.strip[4].comp.knob)

Strip Comp parameters are defined for PhysicalStrips.

knob defined for all versions, all other parameters potato only.

The following properties are available.

• knob: float, from 0.0 to 10.0
• threshold: float, from -60.0 to -10.0
• damping: float, from -60.0 to -10.0
• bpsidechain: int, from 100 to 4000
• attack: float, from 0.0 to 1000.0
• hold: float, from 0.0 to 5000.0
• release: float, from 0.0 to 5000.0

example:

vm.strip[2].gate.attack = 300.8

Strip Gate parameters are defined for PhysicalStrips.

knob defined for all versions, all other parameters potato only.

The following properties are available.

• knob: float, from 0.0 to 10.0

example:

vm.strip[0].denoiser.knob = 0.5

Strip Denoiser parameters are defined for PhysicalStrips, potato version only.

The following properties are available.

• on: boolean
• ab: boolean

example:

vm.strip[0].eq.ab = True

Strip EQ parameters are defined for PhysicalStrips, potato version only.

• gain: float, from -60.0 to 12.0

example:

vm.strip[3].gainlayer[3].gain = 3.7

Gainlayers are defined for potato version only.

The following properties are available.

• prefader
• postfader
• postmute

example:

print(vm.strip[3].levels.prefader)

Level properties will return -200.0 if no audio detected.

The following properties are available.

• mono: boolean
• mute: boolean
• sel: boolean
• gain: float, from -60.0 to 12.0
• label: string
• returnreverb: float, from 0.0 to 10.0
• returndelay: float, from 0.0 to 10.0
• returnfx1: float, from 0.0 to 10.0
• returnfx2: float, from 0.0 to 10.0
• monitor: boolean

example:

vm.bus[3].gain = 3.7
print(vm.bus[0].label)

vm.bus[4].mono = True

The following properties are available.

• on: boolean
• ab: boolean

example:

vm.bus[3].eq.on = True

The following properties are available.

• normal: boolean
• amix: boolean
• bmix: boolean
• composite: boolean
• tvmix: boolean
• upmix21: boolean
• upmix41: boolean
• upmix61: boolean
• centeronly: boolean
• lfeonly: boolean
• rearonly: boolean

The following methods are available.

• get(): Returns the current bus mode

example:

vm.bus[4].mode.amix = True

print(vm.bus[2].mode.get())

The following properties are available.

• all

example:

print(vm.bus[0].levels.all)

levels.all will return -200.0 if no audio detected.

The following methods are available.

• fadeto(amount, time): float, int
• fadeby(amount, time): float, int

Modify gain to or by the selected amount in db over a time interval in ms.

example:

vm.strip[0].fadeto(-10.3, 1000)
vm.bus[3].fadeby(-5.6, 500)

The following properties are available

• name: str
• sr: int
• wdm: str
• ks: str
• mme: str
• asio: str

example:

print(vm.strip[0].device.name)
vm.bus[0].device.asio = "Audient USB Audio ASIO Driver"

strip|bus device parameters are defined for physical channels only.

name, sr are read only. wdm, ks, mme, asio are write only.

The following properties are available.

• state: boolean
• stateonly: boolean
• trigger: boolean

example:

vm.button[37].state = True
vm.button[55].trigger = False

The following methods are available

• play()
• stop()
• pause()
• record()
• ff()
• rew()
• load(filepath): raw string
• goto(time_string): time string in format hh:mm:ss
• filetype(filetype): string, ("wav", "aiff", "bwf", "mp3")

The following properties are available

• A1 - A5: boolean
• B1 - B3: boolean
• samplerate: int, (22050, 24000, 32000, 44100, 48000, 88200, 96000, 176400, 192000)
• bitresolution: int, (8, 16, 24, 32)
• channel: int, from 1 to 8
• kbps: int, (32, 40, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320)
• gain: float, from -60.0 to 12.0

example:

vm.recorder.play()
vm.recorder.stop()

# Disable recorder out channel B2
vm.recorder.B2 = False

# filepath as raw string
vm.recorder.load(r'C:\music\mytune.mp3')

# set the goto time to 1m 30s
vm.recorder.goto("00:01:30")

The following properties are available

• recbus: boolean
• playonload: boolean
• loop: boolean
• multitrack: boolean

example:

# Enable loop play
vm.recorder.mode.loop = True

The following method is available

• set(val): boolean

example:

# Arm strip 3
vm.recorder.armstrip[3].set(True)
# Arm bus 0
vm.recorder.armbus[0].set(True)

• vm.vban.enable() vm.vban.disable() Turn VBAN on or off

The following properties are available.

• on: boolean
• name: string
• ip: string
• port: int, range from 1024 to 65535
• sr: int, (11025, 16000, 22050, 24000, 32000, 44100, 48000, 64000, 88200, 96000)
• channel: int, from 1 to 8
• bit: int, 16 or 24
• quality: int, from 0 to 4
• route: int, from 0 to 8

SR, channel and bit are defined as:

• readonly for instreams.
• read and write for outstreams.

example:

# turn VBAN on
vm.vban.enable()

# turn on vban instream 0
vm.vban.instream[0].on = True

# set bit property for outstream 3 to 24
vm.vban.outstream[3].bit = 24

Certain 'special' commands are defined by the API as performing actions rather than setting values.

The following methods are available:

• show() : Bring Voiceemeter GUI to the front
• shutdown() : Shuts down the GUI
• restart() : Restart the audio engine
• reset(): Applies the reset config. (phys strip B1, virt strip A1, gains, comp, gate 0.0, mute, mono, solo, eq false)

The following properties are available.

• showvbanchat: boolean
• lock: boolean

example:

vm.command.restart()
vm.command.showvbanchat = True

showvbanchat and lock are write only.

• ins outs : Returns the number of input/output devices
• input(i) output(i) : Returns a dict of device properties for device[i]

example:

import voicemeeterlib
with voicemeeterlib.api(KIND_ID) as vm:
    for i in range(vm.device.ins):
        print(vm.device.input(i))

The following properties are available:

• reverb: boolean
• reverb_ab: boolean
• delay: boolean
• delay_ab: boolean

example:

vm.fx.reverb_ab = True

The following properties are available:

• postfadercomposite: boolean
• postfxinsert: boolean

example:

vm.patch.postfxinsert = False

• get(): int
• set(patch_in): int, valid range determined by connected device.

example:

vm.patch.asio[3].set(4)

i, from 0 to 10

• get(): int
• set(patch_out): int, valid range determined by connected device.

example:

vm.patch.A3[5].set(3)

i, from 0 to 8.

• get(): int
• set(channel): int, from 0 up to number of channels depending on version.

example:

vm.patch.composite[7].set(4)

i, from 0 to 8.

• on: boolean

example:

vm.patch.insert[18].on = True

i, from 0 up to number of channels depending on version.

The following properties are available:

• sr: int
• asiosr: boolean
• monitoronsel: boolean

example:

vm.option.sr = 48000

The following methods are available:

• buffer(driver, buf) : Set buffer size for particular audio driver.
  • buf: int, from 128 to 2048
  • driver:str, ("mme", "wdm", "ks", "asio")

example:

vm.option.buffer("wdm", 512)

• get(): int
• set(delay): int, from 0 to 500

example:

vm.option.delay[4].set(30)

i, from 0 up to 4.

The following properties are available:

• channel: int, returns the midi channel
• current: int, returns the current (or most recently pressed) key

The following methods are available:

• get(key): int, returns most recent velocity value for a key

example:

print(vm.midi.get(12))

get() may return None if no value for requested key in midi cache

• apply Set many strip/bus/macrobutton/vban parameters at once, for example:

vm.apply(
    {
        "strip-2": {"A1": True, "B1": True, "gain": -6.0},
        "bus-2": {"mute": True, "eq": {"on": True}},
        "button-0": {"state": True},
        "vban-in-0": {"on": True},
        "vban-out-1": {"name": "streamname"},
    }
)

Or for each class you may do:

vm.strip[0].apply({"mute": True, "gain": 3.2, "A1": True})
vm.vban.outstream[0].apply({"on": True, "name": "streamname", "bit": 24})

vm.apply_config(configname)

You may load config files in TOML format. Three example configs have been included with the package. Remember to save current settings before loading a user config. To load one you may do:

import voicemeeterlib
with voicemeeterlib.api('banana') as vm:
    vm.apply_config('example')

Your configs may be located in one of the following paths:

• <current working directory> / "configs" / kind_id
• <user home directory> / ".config" / "voicemeeter" / kind_id
• <user home directory> / "Documents" / "Voicemeeter" / "configs" / kind_id

If a config with the same name is located in multiple locations, only the first one found is loaded into memory, in the above order.

You may also load a config that extends another config with overrides or additional parameters.

You just need to define a key extends in the config TOML, that names the config to be extended.

Three example 'extender' configs are included with the repo. You may load them with:

import voicemeeterlib
with voicemeeterlib.api('banana') as vm:
    vm.apply_config('extender')

By default, NO events are listened for. Use events kwargs to enable specific event types.

example:

import voicemeeterlib
# Set event updates to occur every 50ms
# Listen for level updates only
with voicemeeterlib.api('banana', ratelimit=0.05, ldirty=True) as vm:
    ...

Use the Subject class to register an app as event observer.

The following methods are available:

• add: registers an app as an event observer
• remove: deregisters an app as an event observer

example:

# register an app to receive updates
class App():
    def __init__(self, vm):
        vm.observer.add(self)
        ...

Use the event class to toggle updates as necessary.

The following properties are available:

• pdirty: boolean
• mdirty: boolean
• midi: boolean
• ldirty: boolean

example:

vm.event.ldirty = True

vm.event.pdirty = False

Or add, remove a list of events.

The following methods are available:

• add()
• remove()
• get()

example:

vm.event.remove(["pdirty", "mdirty", "midi"])

# get a list of currently subscribed
print(vm.event.get())

voicemeeterlib.api(KIND_ID: str)

You may pass the following optional keyword arguments:

• sync: boolean=False, force the getters to wait for dirty parameters to clear. For most cases leave this as False.
• ratelimit: float=0.033, how often to check for updates in ms.
• pdirty: boolean=False, parameter updates
• mdirty: boolean=False, macrobutton updates
• midi: boolean=False, midi updates
• ldirty: boolean=False, level updates
• timeout: float=2.0, maximum time to wait for a successful login in seconds
• bits: int=64, (may be one of 32 or 64), overrides the type of Voicemeeter GUI {Remote}.run_voicemeeter() will launch

Access to lower level Getters and Setters are provided with these functions:

• vm.get(param, is_string=False): For getting the value of any parameter. Set string to True if getting a property value expected to return a string.
• vm.set(param, value): For setting the value of any parameter.

example:

vm.get('Strip[2].Mute')
vm.set('Strip[4].Label', 'stripname')
vm.set('Strip[0].Gain', -3.6)

Access to lower level polling functions are provided with the following property objects:

True iff a parameter has been updated.

True iff a macrobutton has been updated.

True iff a level has been updated.

• errors.VMError: Base custom exception class.
• errors.InstallError: Exception raised when installation errors occur.
• errors.CAPIError: Exception raised when the C-API returns error values.
  • The following attributes are available:
    • fn_name: C-API function name.
    • code: error code
  • For a full list of error codes check the VoicemeeterRemote header file.

It's possible to see the messages sent by the interface's setters and getters, may be useful for debugging.

example:

import voicemeeterlib

logging.basicConfig(level=logging.DEBUG)

with voicemeeterlib.api("banana") as vm:
        ...

To run all tests:

pytest -v

• Voicemeeter Remote C API