from what i can tell they are built around the same circuitry, but the VT999 has a few more bells, whistles, noise gate and 3-band EQ.
i think most of what i heard about the VT911 was on harmony central.
http://reviews.harmony-central.com/r...ger/VT911/10/1
people seem to like it in a hideous sort of way- mostly just guitarists there though.
the VT999 has a much higher rating, for what its worth and some bass players like it too [myself included].
http://reviews.harmony-central.com/r...e+Monster/10/1
i like my pedal pretty well, have even gotten compliments on it believe it or not. i think i am going to change it some more tonight...maybe give the ol 12at7 another shot.
stock it sounded like...majorly bad. NO ONE who reviewed either of these kept them stock. so keep that in mind.
i swapped out an input cap too to make it more bass friendly. that with the 3-band EQ=no bass suck. and the bypass doesn't suck tone either.
oh yeah, and when using my active bass, i need to turn down the volume on my bass to get it to do clean boost at all. that is why i am going to try the 12at7 again...maybe even find a 12ay7 for kicks....