Hi there (First post cherry popped)

I’ve just bought a DMM off Ebay, it’s a late nineties model, it has it’s original wooden box, and it’s not true bypass.

Overall I’m very happy with it, it’s just what I’ve been looking for. However a couple of issues have arisen. Firstly there is a drop volume when the pedal is engaged, and there is a distinct amount of hiss or white noise, when I use this in conjunction with my Stereo Clone Theory, the hiss is very noticable. I have tried before and after my overdrive pedal and at low level settings. Is this noise normal, and if so, what could I do to rectify at all. Would a compression pedal help.

Many thanks in advance.