Florian Hecker and Russell Haswell have done a lot of Xenakis based stuff over the years.  Hecker had a full suite of things for SC 1 and 2, and they use the UPIC system now. 

On Tue, Aug 12, 2008 at 7:39 AM, Derek Holzer <derek@umatic.nl> wrote:
Isn't there an implementation of GENDYN in Supercollider?

http://danielnouri.org/docs/SuperColliderHelp/UGens/Oscillators/Gendy2.html

best,
Derek