You still haven't listed what hardware you have, and what exactly you are trying to accomplish creating an X/Y problem. https://xyproblem.info/
You just suddenly mentioned the proprietary QY8/10 format. The QY8 can be used as a synth with standard MIDI input, and playback standard MIDI to a generic MIDI synth so it could be played back via a DAW on a PC. That's just normal MIDI data that should work with everything.
It has has the ability to connect a MIDI keyboard and record playback in to a single part of a track.
The only thing I'm not sure of would be loading a pre "recorded" song back into the device to then edit it further. You have the ability to export one or all song at a time via MDF2 which you can record. You could try playing that back to the device and see what happens if that's what you are trying to accomplish. Or maybe the realtime record lets you grab all of the parts at once.
But you really should just state what your end goal is, and what specific devices you are trying to use. There very well could be a completely different solution that does exactly when you want, but using a different path.