Ibanez LA metal : LM7

[alfafalfa]

 Dug through my old fx boxes and found this LA metal  box .
I never liked it, totally useless sound, bought it on the internet once, secondhand.
Does anybody have a schematic for this one  for I would like to transform it into something usable.
Any ideas to improve it or should I just toss the board and put a DrBoogey into it ?

Regards, Alf