I had my modded GAP Pre 73 preamps for 3 years now and they are absolutely the best preamps in my rig. I use them for tracking, mixbus, and mid-side mixing. The difference between the original and the modded preamps is that the modded preamps does not have that wooly gain and has smooth saturation above 40db of gain. If you own a pair of GAP Pre 73's get them modded if you plan on using them on a mixbus. Clewythe13 www.cvd13.com"