I just picked up a Diamond J-Drive in a smooth trade with fellow Gear-pager Tweak. This is the version before they added the treble booster (i.e. it's not a J-Drive TR or Mk3). The warmth control seems work well adding fatness and girth to bridge pickups. Any users here that would care to comment on their experiences with this pedal? Also, I'm curious how the drive section of this pedal differs from the Mk3.