Incorrect interpretation of old/exotic midi files

[Grandbuldozer]

First off, I should clarify that this isn't an issue that's exclusive to ModPlug, as I encountered it in a number of midi related programs.
It mainly concerns older midi files, which were usually made with exotic software or extracted from midi centric hardware like the Roland SC-88.
The current version of FB2K's MIDI Player seems to read most of those files properly. On Android Droidsound-E had this exact issue with its older builds.
I included an example midi file, as-well as a lossy converted fragment of how it was supposed to be be interpreted (using the SC-55 EmperorGrieferus SF).
P.S. I was unsure whether this should've been qualified as a bug report or a feature request, since the midi interpreter of ModPlug is a secondary feature the adjustment of which might not be considered as important; Hence the creation of this thread.

[Saga Musix]

I think the main issue here is that the MIDI file uses two output ports to double the number of channels. It's not really an exotic feature - it's a well-defined part of the SMF specification - but it's not used a lot, so there was no priority for implementing it. I have a half-finished implementation somewhere, I'll see if I can finish that.

[Grandbuldozer]

Much appreciated. Hope to see this feature finally implemented one day.

[Saga Musix]

There wasn't much left to do, so the next version of OpenMPT should play this track in a better way.