Lowrider fuzziness?

[harpplayer]

Tried to change the pots values, but it made no difference too (by looking at the schematic, I assumed the pots would control the voltage applied, but I may be wrong), so, since it is not a design shortcome - and as I am probably the only one experiencing this -, it is possible leakage. Still can´t seem to find where the signal could possible be leaking...