I am toying with the idea to re-start playing with
digital synthesis
once again (haven't done so in a while now). Judging by the number of
synth packages in the Debian archive, there is more than a few out
there; however, most of them (bristol, ams, etc.) seem to be
GUI-controlled (and hence require an x-server), which is not very
practical for me.
om is what you are looking for I think :
http://www.nongnu.org/om-synth/
anything osc driven is scriptable, or commandline capable - whether it has
a gui or not.
When I get any time, I want to do a formal release of noiseweapon:
http://tinyurl.com/7woyy
which is a small performance orientated fixed function synth 100%
controlled by osc (although the lack of any midi support means it probably
has a limited appeal atm :)
cheers,
dave