I use a digital track recording and mixing program for Macs called HD Studio, with bunches of filters and tracks capable of being combined into stereo or mono and output to .aiff. From there I can produce MP3s using SoundJam converter. There are lots of PC equivalents that have even mor features -- some in fact have too bloody many and a simple performer like moi can get lost in the technical aspects of recording engineering, which I don't make time to do. The output is workable if not world-class. You may have heard it on the Mudcat radio -- it's basically just .aiff output with little polish, but sufficient for my simple purposes so far.