I once was a professional (mostly classical music) sound engineer, musican, composer. Now I'm returning to music ... electronic music composition.. I have a large (mostly) Buchla synthesizer system which has quadraphonic mixing (front-left, front-right, rear-left, rear-right ) with full panning ablitity, reverb etc.. (why doen't my "Enter" key work here?) ... My question is I need recommendations on how to record in quad with the intent of mixing down to DVD (quad) and CD (I think it must be 5.1 that will best reproduce the quad intent). I have Sonar Production X2 and Pro Tools (haven't used yet) ... and 6 good Windows or Linux PCs .... I think what I need is 4 channel ADC (Burl?) .. then I'll also need DAC for playback? Most recording inputs will come from synthesizers , some from instruments ... I only currently have a Echo Gina audio card .. but will purchase whatever I need.. The goal is to be able to master CD/DVD (for sound only) .. myself .. or to record the 4 discrete tracks .. and then take it to a studio for final mix down if that is best.... sorry for the single paragraph,, my Enter key doesn't seem to work on this forum.