Here's the input section of the customized preamp:
This is what he used for the treble channel. For the bass channel, there is a jumper cable from TO BASS CHANNEL to the input of the mostly standard F-1X mounted below this one.
He can plug 2 Alembic Series I basses in and another bass (either stereo or mono) in the 1/4 input. He uses the standby function on the Alembics if he wants to use another bass in the 1/4, then he needs to select mono or stereo for the 1/4 input function.
Since he doesn't use the crossover, we replaced the HF control with a wet/dry mix for the the effects loop so he can use just the amount of the effector units that he wants.
There's also a dedicated tuner output on the back.
From the reports I received through his tech, Stanley is totally loving the new preamps and it's simplified greatly what he needs to travel with. Now he can bring the small rackmount stuff in the cabin when he flies - it's amazing how often baggage is either delayed or lost when you travel alot. This setup removes that worry.