Played my first gig last night with my new Source Audio Soundblox Bass Envelope. I got the basic model rather than the Pro, as I have limited use for an envelope filter and don't require all of the presets and massive processor power of the Pro unit. I had tried working with the MXR M82, which is a fine sounding unit. But I was never able to control it to my satisfaction. For my application, I was looking for a very short-decay "wuh" sound, with a limited sweep, and the MXR seemed limited to big, dramatic, swishy sweeps that I simply couldn't get under control. This was partly my own fault, as I mistakenly assumed that the Decay knob on the MXR allowed adjustment of the duration of the sweep, which it does not (it simply sets the frequency center at the bottom of the sweep, which is cool in its own right, but not what I needed). The Source Audio unit allowed me to quickly dial in a hugely fat, fast four-pole filter sound that achieves a complete range of the sweep even when playing sixteenth notes. THIS is what I was after! It worked flawlessly in the tunes I used it on last night, and I felt that the pedal was working with my playing rather than being something I was fighting with. I was able to concentrate on playing my bass rather than playing the effect. I haven't had time yet to delve too deeply into the other settings, although I also used one of the phase/filter settings last night and it was very slurpy and groovy... it added a nice touch to one of the few bass solos I get to take. I've read some criticism here on TB that this pedal sounds "digital" or "sterile," and while I did not find this to be the case even when playing it straight into my amp, I did find that running it into my Xotic BB Bass Preamp dialed in for just a touch of hair made it sound very vintage and organic. In any event, I seriously doubt that anyone in the crowd last night was thinking, "Oh NO! Ken just switched on a DIGITAL pedal!" when I used it. Our sound man loved it (although he did ask me to turn down!). Overall, the level of control over attack, release and sweep make this a real winner for my musical needs. I'd say the only drawback is the physical size of the unit... it's huge, and required me to get inventive with the cabling on my PT Mini board. It looks a bit silly, and I don't in general like the visual aesthetics of Source Audio pedals (I like little metal boxes), but this is an inconsequential matter given the excellent sonic results I'm experiencing with this unit. If you're on a quest for a very controllable envelope pedal, give the Source Audio products a serious look. For the record, my setup is EBMM Sterling 5 HH > Soundblox Envelope > Xotic BB Bass > DMB Bumble Bass Fuzz > EBS Unichorus > Tech21 VT Bass > MarkBass CMD121P + NY 151 cab. Rock on!