The electronics are a channel of a standard series low-pass filter (PF6) and a channel of multi-mode filtering (FL107), both with CVQ. The switch closest to the neck switches between hi/band/lowpass filtering, then filter in/out, the order of the filters (series or parallel), then mono/stereo. The fretted bass also has a notch filter switch as part of the multimode channel that the Alembic magicians added when it went to the mothership for love, attention, the pickup + hum update, and refinishing in 2015.