I have this vague notion of trying to use the #uxn VM as a musical sequencer.
The gist of it would work like this: spawn an instance of the uxn VM inside of an audio DSP ugen that takes in an audio-rate clock signal, and then load a ROM into it. Every time the clock ticks, it runs the uxn program until it reaches a halt statement. The program would then be able to somehow have some sort of I/O that would allow it to write sequences. You'd have to make sure that the program does halt, eventually (In the past, I've hard-coded a maximum number of instructions per tick before breaking).
I've explored this concept of using a VM for music a few times myself, but uxn is far more developed VM than anything I've ever done, with much better tooling.
Previous works of mine include SeqVM (VM for making sequences), trigvm (a VM for making rhythmic trigger signals, built to be programmed on the monome grid in a program I wrote called trig):