Burningyen,
Just curious if you used the "muffin" in your profiles? I can't seem to dial it in with the DR103. Any tips here or are you using a real Muff in front?
Yeah, I'm finding the Muffin tricky too. It doesn't sound or behave like the Big Muffs I prefer (clones/variations on the 1973 Ram Head model). It's darker, gainier and not as smooth. It's too bad, because the Muff sim in my RP355 pretty much nails the tone:
http://www.youtube.com/watch?v=gD9BVvRk3UE
I'm getting the best results putting the Compressor sim in front of the Muffin. I can't say that I have it 100% dialed in yet, but at least it's smoother, less spitty. I may try inserting an EQ before or after to see if I can get it closer to the Ram Head. It would be nice if Christoph added some more Muff variations, or maybe different transistor/tonestack options.