[quote name='Toasted' post='6895' date='May 25 2007, 11:12 PM']That's actually two different processes:
Impedance Change
-and-
Buffer.
If you don't know what Impedance is in musical instrument terms, then I strongly suggest that you don't buy an impedance altering device.[/quote]
3 Processes what you've said and the 2 together as impedance can be changed passively like in a DI box but in my case there is some sort of active buffer changing the impedance.
The only separate impedance buffer I've found is one I had to have custom built after many years of struggling with fuzz's and active basses, Subdecay make a pedal called the flying tomato which has a 12k buffer and works fantastically with active basses, MI Audio have the Neo and GI fuzz with variable input bias I believe (Toasted?) which works in a similar manor, so they hard to get and generally custom built but they cost very little if you can get a stand alone unit (Which I have been unable to do even speaking to several custom pedal companies I'm very close with).
But yeah you are really clipping and gating that Fuzz Probe and I'd estimate from the sounds of the gating you are losing about half of the tones available in that pedal especially the high gain ones, other fix is a passive bass.