i just had a try at it,
wouldn't say it sounded particularly amazing, but i managed to build enough up in a few minutes to make it kind of interesting. will try again later and see if practice makes things better.
best idea i came up with in the first run:
[key] | [t b] | [random 10] | [sel 0 1 2 3 4 5 6 7 8 9]
that way, while i was coding, sounds were being changed and triggered by keystrokes.
personally i think if you're going to do live coding, you should do it from scratch without using abstractions.