I was mostly referring to the latency. RTOS kernel prioritizes timing over performance, so it should be right up your alley when it comes to music handling. I know it has been used in some instruments and mixers.

Jack is kind of iffy to tinker around I agree, however PipeWire, which is these days standard on up to date distributions should handle latency much much better without any great need for tinkering as it supports all the interfaces of Jack, PulseAudio and others. So you can just use whichever application you want and you get low latency backend regardless.

Things are improving at a rather fast pace in Linux world and even giving developers feedback is a useful contribution.