This is a BOSS DS-1 modified by Robert Keeley
the CONTRL are the same: tone, dist, volume
Keeley changes several components, see his website: http://www.robertkeeley.com/product.php?id=10
and adds a miniswitch, to switch between two modes of distortion

UTILIZATION

C obviously very simple and super easy to use
records provided, BOSS and Keeley, offer many examples of rglages

SOUND QUALITY

The Keeley mod has nothing ave see the pedal base
the sound is much more open, broad and ample hot
it replaces a perfect channel amp a little winded
grain sings wonderfully
c a pedal register trs "rock n roll", it is less suitable to the metal and blues but we can do it anyway, APRS and regalges depends on your gear
it sounds a bit "harsh" enough ie sharp, acute, but lowering the tone does not pose a problem to balance the sound
I IDAL, unwanted in a LP Junior P90 faded in for the good old stuff to the phone etc., c pr IDAL's really that I saw no vox AC30 lol

OVERALL OPINION

I just know I wanted to finally buy the quality Keeley
I believe following and I will take other