mwg API
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    Variable INTERNAL_MIDI_ENGINESConst

    INTERNAL_MIDI_ENGINES: readonly string[] = ...

    The two engine names that are not synths: they mean "the internal path", SoundFont when one is given, else the built-in approximation.

    import { INTERNAL_MIDI_ENGINES } from '@datamoc/mwg/audio';

    console.log(INTERNAL_MIDI_ENGINES.includes('builtin')); // true