Thanks Stephen. I'm new to Alembic and thus not familiar with the various model references. Which preamp are you referring to?
Bass Models Controls
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P/AE-1 volume, filter 950
2P/PVF volume, pan, filter 1200
JZ/PVF volume, pan, filter 1200
PJ/PVF volume, pan, filter 1200
AXY/PVF volume, pan, filter 1250
AXY56/PVF volume, pan, filter 1350
MXY/PVF volume, pan, filter 1250
MXY56/PVF volume, pan, filter 1350
for PVF-2 or AE-2 models (adds Q-switch), add $50
no charge for AE-3 (bass and treble instead of filter)