Customer has a cix40 with lvmu. playing messages are distorted and hard to decipher. It seems like i have ran across this once before but i do not remember what fixed it.

I don't recall having that problem with CIX40 but CTX28 was a pain in the *ss. You must ground the system on a good ground like pipe or an electrical ground

I had this issue with a GVPH in a CIX40. Playback sounded like it was slowed down.

Also had a similar issue with an IES16. Had to replace them in both cases.