Automatic separation of instruments into channels?

[Datseris]

mplay(file) does not automatically separate different tracks into different channels, although it has supports for multiple channels and the documentation shows that it is possible.

using MIDI, Mplay
testmidi()

gives the location of a type-1 midifile with 1 track of metadata and 3 instrument tracks: bass, drums, piano. Loading this file into mplay puts everything into a single channel.

However, even if the same midi file is saved as either type 0 or type 2, the same result happens. Everything is in a single channel.

Would be very cool if this detection could happen automatically (How?).

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For a documentation question, how can one separate instruments into channels?