Hi Julian,
The main difference is that the Series Basses have stereo capability, where the Signature Basses don't.
The Signature Basses have the same basic controls as the Series I (Vol, Tone & 'Q' switch per pickup), but the Series I also has a 4 way pickup selector and two 3 position 'Q' switches instead of the Signature's 2 position 'Q'.
The Series II has a variable 'Q' per pickup, master volume, 4 way pickup switching, volume and tone per pickup and side LEDs.
Oh yeah, the Series Basses have chambered bodies and different numbers of body laminates, neck laminates, unlimited options......etc....
By the way, Stanley Clarke plays a Series I.
Rami
(Message edited by rami on April 03, 2004)