A Series II fretless - I'm seriously jealous.
What are the extra toggle switches on the basses?
They're both customs made in '77 - one channel with standard series II lo pass filter, the other with a "universal" filter channel, with switchable hi/band/lo pass filter. On the fretted bass, Ron added a notch filter option to the universal channel, essentially making it a SF channel. Both have CVQ. The switches are mono/stereo, filter in/out, if the filters run in series or parallel, and notch (on the fretted).
Alembic sure does make magical instruments!