@jack, Yeah, I've got the correct soundfont, and they play fine, but it's converting them to a format other than MIDI that's stumped me for a little while.
I don't want to record manually (cause I'm lazy, duh) but using Switch or other audio converters that even accept MIDI in the first place convert using the Microsoft Wavetable GS Synth (or as I like to call it, "the Microwavable Synth", cause I'd get as much use out of it after microwaving it). Anyway, that site posted earlier strait-up didn't even give me the option to send files the way I had them set up, so that was out of the question.
Small correction: I used those set of sounds on 4.4.2 (Kit-Kat) so it must have been available then too. It looks like 5 brought about the new sounds, though I haven't used 5 long enough to be able to tell you.
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