can anyone recommend a good pitch to CV for bass? I assume that the freqbox is not ideal
The freq box is NOT a pitch to CV device. (Bass or whatever.)
You are going to have to go to modular land to find pitch to CV. Roland does pitch to MIDI.
Here is a start in your search
http://www.muffwiggler.com/forum/viewtopic.php?p=42007&sid=2dfc0b2a8555804853f0e7fab09cf7b5