Hello guys!!

I have a little problem with my bass micro synthesizer, it lights up,
sound goes in but when I switched the effect there is not anything that comes out,
a very low signal. I change the 3PDT, the problem persists.
someone you already had this malfunction?
of any electronic component could it come?
I think the Dual General-Purpose Operational Amplifier RC4558 who may be dead, but I do not find a way to test it.

thank you in advance for your help!

Darwin[/color]