Audio Extensions

Covers the fb.dsp, fb.output, and fb.replaygain namespaces.

fb.dsp DSP Management

getChain()

Returns the active DSP chain in execution order, along with best-effort active-preset information.

const chain = await fb.dsp.getChain();
// chain.dsps: [{ index, guid, name }, ...]

setChain(dsps)

Replaces the active DSP chain.

Parameter	Type	Description
dsps	unknown[]	DSP configuration array passed to dsp.setChain; each entry is read for its guid only

await fb.dsp.setChain([{ guid: '{xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx}' }]);

getPresets()

Returns all DSP presets, their count, and the selected preset index.

const r = await fb.dsp.getPresets();
// r.presets: [{ name, index }, ...]

applyPreset(indexOrName)

Applies a DSP preset by numeric index or string name.

await fb.dsp.applyPreset(0);           // By index
await fb.dsp.applyPreset('My Preset'); // By name

getAvailable()

Returns the available DSP entries. Each entry includes guid, name, and hasConfig.

const r = await fb.dsp.getAvailable();
// r.dsps: [{ guid, name, hasConfig }, ...]

addDsp(guid, position?)

Adds a DSP to the active chain.

Parameter	Type	Description
guid	string	DSP entry GUID
position	number	Optional insertion position; omission appends to the chain

await fb.dsp.addDsp('{xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx}');

removeDsp(index)

Removes the DSP at the specified chain index.

await fb.dsp.removeDsp(2); // Remove the third DSP

moveDsp(from, to)

Moves a DSP within the active chain.

await fb.dsp.moveDsp(0, 2); // Move the first DSP to the third position

fb.output Output Devices

getDevices()

Returns a flat array of available audio output devices. The SDK unwraps the host's { devices, count } envelope.

const devices = await fb.output.getDevices();
// [{ guid, name, entry, entryGuid }, ...]

getEntries()

Returns output-module entries and their capabilities.

const r = await fb.output.getEntries();

getSettings()

Returns the available output module names and any host note. This endpoint does not return the active device configuration.

const settings = await fb.output.getSettings();

fb.replaygain ReplayGain

get(paths)

Returns ReplayGain metadata for one path or an array of paths. The SDK always sends a { paths: string[] } request.

const r = await fb.replaygain.get('E:\\Music\\song.flac');
const r2 = await fb.replaygain.get(['song1.flac', 'song2.flac']);

getMode()

Returns the current source and processing modes.

const r = await fb.replaygain.getMode();
// r.sourceMode, r.processingMode

setMode(sourceMode, processingMode?)

Updates the ReplayGain source mode and, optionally, the processing mode.

Parameter	Type	Description
sourceMode	string	Source mode
processingMode	string	Optional processing mode

await fb.replaygain.setMode('track');

getPreamp()

Returns the preamp values for tracks with and without ReplayGain metadata.

const r = await fb.replaygain.getPreamp();
// r.withRg, r.withoutRg (dB)

setPreamp(withRg?, withoutRg?)

Updates either or both ReplayGain preamp values, in dB.

await fb.replaygain.setPreamp(6.0, 0.0);

getSettings()

Returns the complete ReplayGain settings snapshot.

const settings = await fb.replaygain.getSettings();

scan(paths)

Starts a ReplayGain scan through the host context-menu pipeline. The default mode is 'track'; pass { mode: 'album' } to treat the selection as one album.

await fb.replaygain.scan(['E:\\Music\\song1.flac', 'E:\\Music\\song2.flac']);

clear(paths)

Clears ReplayGain metadata from the specified files.

await fb.replaygain.clear(['E:\\Music\\song.flac']);