OptionalmodeSource mode by number, as config.getReplaygainMode reports it; takes precedence over sourceMode.
OptionalsourceSource mode by name: none is 0, track 1, album 2, and byPlaybackOrder or its other spelling auto is 3. Read only when mode is absent.
Parameters for
config.setReplaygainMode. Set the ReplayGain source mode by number (mode) or by name (sourceMode). One of the two is required;modewins when both are given.replaygain.setModechanges the same setting by name.