Sound Command

[mnrvovrfc]

After examining the $MIDISOUNDFONT and _SNDPLAYFILE commands, I am going to assume that, the safest bet would be only one instrument at a time (soundfont) as the PLAYFILE command can play a multi-instrument midi file as it is....  So, I would have to conclude, as previously suggested, obtain a midi editor and an application that will create individual soundfonts for specific instruments....

https://muse-sequencer.github.io/

For Linux only, this program might be enough for it. I have used it for a short while but to arrange audio, it really sucks for timestretching and tempo-matching. But it seems to be pretty good handling MIDI. I wish I could tell you that I have used it with Soundfonts, my patience wasn't enough because I have something else that is "industrial stronger".

Disregard what is said below, otherwise it's at your own risk!

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https://www.polyphone-soundfonts.com/

I have never used it, so you'll be better than me on it. It might be a better alternative than one available for a long time for Windows called Viena. Yes it's from the capital of Austria which was the same name as the Creative Labs Soundfont editor LOL. This Viena however was very buggy, I don't think it ever left "beta" version. It was confusing to use. Also there's no way to make use of special attributes like reverb, chorus and filter, away from E-Mu/Creative Labs equipment.

A program that I bought would be more clunky for you to use but I'm going to mention it anyway. It's called Chainer, it's a VST2 plug-in that could load as many other VST2 instruments and effects as your machine could handle, and play it all back with a MIDI controller. It has a feature to export to single-file SF2. You have to enable recording, play a key on your keyboard, stop it recording and then export. However, some Soundfont players can't read a file that Chainer creates by this method. I don't remember if Chainer saves a wave file somewhere so it could be edited, because no doubt it would have spaces and glitches that should be cut away.

EDIT: Almost forgot to mention that Chainer wasn't ported to 64-bit. To use it you would need an "older" machine, ie. one capable of only running Windows7 and/or the earliest versions of Ubuntu Studio. Wine could be used but things are starting to go against the older VST plug-ins built in the decade-2000, as the latest updates on Arch Linux, Fedora, Void Linux and a few others. Might want to get Debian "Bullseye" while you still can which has a version of Wine which is considered outdated but has worked very well for me with the older plug-ins. There's a successor to the VST2 format by Steinberg called VST3 which is a headache and incredible mess, to say the least possible. In the very least among free software, you're expected to use the latest releases of Ardour for that.

Now I'm not saying this stuff to discourage you, but this is just in case you want to go further in sample playback, much more capable than cheap pulsey sound from a PC speaker while towercase computers barely contained them, and a soundcard like Soundblaster Pro was still a "costly extra". With Soundfonts could certainly meet or exceed the standards set by IBM PCjr and Tandy1000 at least to play 3-note chords at a time.