Mod to tame TR-2 hiss?

[jayn]

I just got a Boss TR-2 Tremelo.  It's got quite a bit of hiss when it's engaged.  It's not enough to bother anyone on a gig in a noisy bar, but you could never record with it.  Does anyone know any fixes for the hiss?

(Speak s-l-o-w-l-y...I'm a newbie who is trying to understand the circuits better, but it's coming slowly    Using terms like "change RX to YZ would work real well  ))