The soundfont's folder, e.g. https://cdn.example.com/soundfonts/FluidR3_GM/
OptionalformatThe audio format of the files (default: 'mp3')
OptionalhighestThe highest key the host has a file for, as a MIDI number (default: 108, C8)
OptionalinstrumentThe instrument's folder name (default: 'acoustic_grand_piano')
OptionallowestThe lowest key the host has a file for, as a MIDI number (default: 21, A0)
Where recorded instrument samples come from: a host laid out like the
midi-js-soundfontscollection, with one file per key at{baseUrl}{instrument}-{format}/{note}.{format}— the note written with flats for the black keys,Db4,A0…C8.