Don't know if it is of any help, Aidan, but here's a link that talks "around" the problem. Or, at least it sounds like it.Sorry, I can't give you any real answer, in that I don't use Sonar. And, the only time I use r2x files is in Reason.Good luck anyway,BW@http://forum.cakewalk.com/tm.asp?m=1237255