«  Very good boost for crunch amp »

OD pedal, which goes to the distortion.
9v power supply, adjustments Gain / Volume / High / Low, notched knobs.
No knob of medium, but a switch Classic / Modified in that little hollow, adding gain modified.

UTILIZATION

The config is simple, knob greatly affect the sound, especially bass. The switch classic / modified toggles sound classic rich medium to a more digging and with more gain, which can go toward the disto.

I use it for myself as for my crunch boost for some passages. Very effective.

SOUND QUALITY

I use it to boost my crunch (Laney LC 30) with several guitars (humbuckers and mini-humbuckers).
Volume, High and Low at noon, gain at 0. Switch to classic. Result: Perfect! No loss in the lower as with my SD-1 earlier, more gain and presence, respected guitar sound. That's really what I wanted.

I tested also on a clear, sound is very good too, fairly tight grain, especially modified. The OD goes to the distortion with the gain at max. I do not dwell on it because there is no way I'm using. I was looking for an OD

OVERALL OPINION

exclusively to boost the crunch of my amp. I used a Marshall BB2 (a little cold boost), a Boss SD1 (good food but a bit low). I also tried an MXR micro amp (also cold, does not color the sound ... I have not liked), and this one. After testing in a store, I took it.
The sound of the guitar is respected and she eats no bass (even with humbuckers), I can even add to the volume pot.

Adopted!