Thank you Franck and Michal for your experience and hints.
I'll peek into pd. It seems to have a very active community. RTMix looks
very interresting, and is the kind of glue I may need. As a beginning,
I'll try to make PD and Hydrogen and RTMix work together.
It may all end with a "live mode" for Hydrogen build from libhydrogen,
even though I don't know C++ programming. If anyone has perl bindings
for libhydrogen, I would be happy :).
Regards,
--
Charles