Hey…
I been tiding up my seq box and modified the psu/aout/bankstick brd I done for the sid a while back to include also the dc-dc convertor (based on LT1054 chip) for the +/-12 too. I used a 7806 in place of the 09 on the sid psu so got 11V which i fed to the LT, then just used a regular 78/912 after - aint been under much test but seem to be workin fine so far (gate leds are lighting when they should neways ;))