Sound changes when adding modules

[uc.t]

Lets say I have made a patch in the editor and my sequencer is looping it. As it's playing I tweak the sound and wants to try out adding a new module to the patch. I click and drag it into the patch. Immideatly, without doing any rewireing, the sound changes. Add another the sound change (back?) again. The same thing if I change a patch in one of the slots, the other ones change and sounds thinner. Change to another patch and the rest change again. I belive I've read something about this on sound on sound's web, but are all NM's like this. I've owned two before the one I have now, and I can't recall having the same annoying problem....

[davep]

This usually happens when your patch has more than one oscillator in it and they are tuned to the exact same pitch. When the patch loads, or when you add or delete a module, the phase relationships of the oscs will change to some new random phase relationship. This causes a change in the sound that is sometimes subtle, and sometimes drastic. If the sound gets very thin and quiet it is because the waveforms are almost 180 degrees out of phase.

How do you prevent this?

First, decide if you really need multiple oscs. If they are tuned to the exact same pitch, you may not need more than one.

If you really do need multiple oscs tuned to the same pitch (like maybe a sawtooth plus a sine wave added to beef up the fundamental, or if the two oscs are being used for some FM synthesis) you can use hard sync to make sure they always keep the same phase relationship.

[uc.t]

Great awnser! Thanks!