I have acquired a few toys that I'm going to put together in a pedal board. How would you hook up these items for the cleanest, unadultered sound? The toys, in random order: 1. Sadowsky floor model preamp/DI 2. EBS octabass 3. Ernie Ball volume pedal 4. pedal doctor custom 3-input/1 output variable gain stage (upto +10dB for maintaining a constant signal level between different basses) All of the units requiring power will be powered with a DC Brick.