[MIDI] Ability to combine synthesizers on playback

[freq-mod]

I don't know if Im suggesting it in the correct place and not libADLMIDI/AudioCodecs/Moondust but ok:

My idea is very similiar to this: jpcima/smf-dsp#32 - "Since this player supports multiple synths, also sf2 based like Fluidsynth, would it be possible to "mix" two midi snth instances. One synth would play some MIDI channels (specified in config file), other the rest. That would also allow for some kind of Sound Blaster 16 PCM emulation when mixed with libADLMIDI."

Is it possible?