I use either celp or simple compression because my transmitted audio is broken up whenever I use anything else. Celp is the only mode in which my audio sounds decent. >>>>> "Adam" == Adam Myrow <amyrow at midsouth.rr.com> writes: Adam> Why not GSM, the default mode? GSM sounds 100 times better Adam> than simple compression and compresses down to a level that Adam> it works over a 28.8K dial-up line. Celp is only in the Adam> very latest Unix version of Speak Freely and a beta for Adam> Windows. It takes a very fast CPU to compress. GSM has Adam> been supported for a long time, so stick with it.