That's my 'project' Dingwall fretless. It was a used Combustion I bought cheap locally from a friend. It sat unused for a year or so until I decided it should be a fretless. It sounded great fretless but I wasn't happy with the fingerboard work on it. The other thing is that it acoustically sounded wonderful but wasn't actualizing that amplified...to get closer to what I was hearing, I did a few things...
-Darkglass Tone Capsule, since I thought the EQ points made more sense for fretless.
-Moved the pickups back into the Z2/NG2 position.
...that helps but...since was sending the bass to Mo to rip out the inlay, re-luminlay the neck and finish it we'd do some other things.
-Piezo bridge pieces
-Piezo preamp that piggybacked off of the same 18v power supply
-3 position switch that gives DG-TC, Piezo, or both.
-Toggle that acts as a master on/off for the preamps
-push/pull for the DGTC preamp passive/active
-push/pull for the piezo preamp for a tone-profile shift
-stacked the highmid/lowmid on the DGTC
That way we didn't need to put in any more knobs and the layout only added a single toggle.
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...the tube preamp is a cool little kit. the board/components are about 15-20 bucks. the case costs another 12 and the power supply is another 15 bucks or so. It actually sounds surprisingly good. I'm using it on a stereo to fuss up my digital input for mp3 and streaming music...sound nicer than it should.