I think you'll be fine running app_rpt with one USB sound device on a 1.1Ghz system. I have run 2 URIs on an 800 Mhz system (using TLB which eats more clock cycles then app_rpt) with only minor CPU speed issues... slowness was noticeable when festival would run. -- Tim :wq On Oct 21, 2009, at 12:17 PM, Steve Gladden wrote: Hello.. I'm looking for a little feedback on those who have experienced and used the USB sound device and realtime CPU requirements for the DSP routines.. Reading the documentation suggests that I MUST use at least a 1.3Ghz CPU for usb_chan applications. The dilemma I have is that I have a beautiful rackmount AMD Duron 1.1Ghz CPU server sitting right here that would be awesome for the application if it will keep up.