El problema con el Big Muff es que no le va bien. Aquí lo explica:
http://www.gilmourish.com/?p=7115
"I like to say that there are no rules when it comes to tone and choosing pedals and amps, but keep this in the back of your head:
Mids scooped and uncompressed amps (Fender/Vox and similar) – NO fuzz, Powerbooster and Muff. ONLY Tube Screamer and Rat (or similar sounding clones).
Mids boosted and compressed amps (Marshall/Hiwatt and similar) – NO Tube Screamer and Rat (or similar sounding clones). ONLY transparent, mids scooped or flat EQ overdrives, distortions and fuzz".
Aquí sobre los tipos de amplis limpios:
"Now, the bigger and louder Fender amps, like a Twin, also has a lot of headroom – meaning that they have less compression and need a lot of volume to break into overdrive/distortion. Combine that with scooped mids and you get a very open and pristine clean tone.
If you add a fuzz or Big Muff to that, with their square wave clipping, it will sound pretty nasty and harsh. There’s nothing to compress the fuzz and even out that sharp edge square wave, and no mid range to compensate for the scooped tone coming from the pedals".
Y aquí sobre el Vox en particular. Pero volvemos a lo mismo, hay que "retorcerle la oreja al ampli" para sacar medios:
A third kind of amps are the ones with a fixed mid range, like the Vox AC30, which doesn’t have a dedicated mid range control.
Bryan May certainly has plenty of mid range coming from his wall of AC30s and by rolling down the lows in particular, he allow more space for the fixed mid range to cut through. The fact that he also plays insanely loud, will create tube and speaker compression.