daniel@xxxxxxxxxxxxxxxx wrote: >>But when I introduce playing a sound file along with "monitoring" >>(the above example), then the rumbling starts. > Could this be an analogue feedback problem then? > > Cheers > > Daniel Things are way to convoluted on my system even start thinking about what's going on. I'm just going to strip everything away and start all over with a more simplier set-up. Currently, I'm manipulating tkeca (front end to ecasound) to do things it wasn't designed to do... exporting to .ecs file to study it... There's the two card set-up with capture set to re-direct to the second card... In keeping up with the latest releases of ecasound, I now have 2 different "rc" files... It's a long story, but I'm going to strip everything down and start from a more basic set-up. Thanks for inquiring though... Rocco