i think the nearest thing to cool edit for linux is
SND
i know that there is success running cool edit 1.2 (which imo is better than 2.0) under wine in linux so that may be another alternative...also even if you do try using wine, theres nothing to stopping you from trying 2.0 just to see if it will work...if it don't work, then maybe it just dont' run with wine.. i say this cause i haven't seen anything related to 2.0 and wine so thats why i am unsure about this version
