Here's why I ask. I wrote to BBE and asked about using their new "Sonic Stomp" pedal with my head. Basically, the reply I got was that they are best used after the preamp and just before the power amp. Easy enough in a rack rig, but where do you put it when you use a head? I assumed that since both BBE and Aphex make a pedal version of their rack units, that one can use them as a pedal - before the head. Are any of you using either of these units with a head? What kind of results?