Yeah the "fader" connects to the EQ/volume/pitch board, that's where all the magic scratch circuitry is. There's a little VCA on that board to do the cutting, and it's also where the AUX signal is mixed in. There are virtually no other differences between the 01usb and the 01scratch (I think the main board is identical). Thank Rasteri, as you've probably have read in my other post, ive been seriously obsessing over having an internal fader wheather it be with my raiden/other fader(maybe from my old rane mixer) or whatever.. after discovering the fader hole/mount in my pt01 case, I'm lookIng into trying to replicate the scratch's fader circuit..especially since jddesigns is dropping that new fader for the scratch...