Fitted to a Behringer VT999 overdrive, this gives a wider range of crunch. The full tilt scream-o-crush is still there, above 2'O'clock on the gain dial, but now more gentle break-up sounds are easier to dial in than before. Much easier. It makes the VT999 eminently capable as either a pre-amp into FX return, thus bypassing the amps pre or into the front of an amp whose gain stage is a little too bitey.