Kramer DMZ4001A preamp help - decode schematic?

I recently acquired a Kramer DMZ4001A from @roger (thanks Roger!) and I'm wondering about what the preamp does. I can see one of the switches is series/parallel and the knobs are volume and what looks like passive tone. So all I really need to know is what the 3 position switch next to the volume control does (switching it it seems like it gives a lot of boost!). There is a schematic here but I can't read them: http://www.vintagekramer.com/Electric/wiring-dmz4000prea

By bloke_zero, March 19
4 replies

I didn't find another schematic, just the other descriptions all had 'coil tap' as one of the switches, where it is surely series/parallel. Thanks for having a look guys! I'm thinking of them as 'big, bigger & biggest' settings right now. With the PU too close to the strings I think I can hear some overdrive in the preamp so some further experimentation required (battery is fresh).