Lost volume

[rbino]

Hi! I'm from Italy and I'm new to Circuit Bending.
I'm modifying a little thing that plays 8 different noises from GBC and on that thing everything is going right, but while I was modifying it I opened another toy to test it, and while touching around with the probes it crashed. Now it turns on but it outputs its music at a very low volume, you have to stick you ear to the speaker to ear it.
Yesterday evening I opened another device, the kind of device that beeps when you enter in a shop, I don't know its name in English, and while I was testing connections it crashed and now it behaves the same way!
Can you suggest me some solution or, at least, the errors that I could have made so the next time I will pay more attention?
Thank you in advance!

[Gordonjcp]

You may have damaged the audio amplifier.  Trace out the circuit from the loudspeaker back, and see what components there are.

[rbino]

Do I have to trace both the positive and negative wires going to the speaker? And, the positive wire it's not at the and of a track, it's in the middle, do I have to trace in both directions?
Thanks for the help

[Gordonjcp]

Yup, the whole thing.  You may find that it disappears into some anonymous black blob, in which case you're stuffed.

[rbino]

One wire goes to a track with only two solder points on it and it connects directly to the Power/Low volume/High volume switch, the other connects to the switch, to the positive leg of an electrolytic capacitor and to 4 resistors' legs.
What can I do to check these components?

[Gordonjcp]

Okay, the power/low volume/high volume switch sounds interesting.  Trace the volume pins back from there.

Don't worry about testing the resistors or capacitors, it probably won't be them.