Loud squeal/hiss from Smash Drive

[zener]

I'm a newbie and this my first attemp to build one.

I had a Smash Drive wired into a breadboard. It is working now, but I have some problems with it.

When I push the switch on, there's always a sudden short (less than a second) burst of strong sound, then it will go to its normal level. While playing with the circuit on, I always get a fading in loud squeal or hiss whenever I stop playing. :x  Another thing, the tone seems to be lower than usual though the treble pot is at full. I actually use a karaoke which mic input was modified by my dad so that I can use it as guitar amp. I don't any problem with it putting my guitar straight into it.

By the way, the circuit is still in the breadboard and the wires are kinda tangled but I looked a lot of times for any shorts and there was none.

Is this normal? Does the loud noise disappear if I put into a PCB then in an enclosure? If not, what might be the reason and what can be done?

Thanks for any help  :wink:

Zener