This is a weird one. APX 6500 with remote o5 head, audio is mute when audio pot is turned all the way down (expected). However, audio doesn't actually show up until the vol pot has been rotated more than expected, and then when audio is present, the volume is way higher than expected. I presumed it was the vol pot itself, so I replaced it with a known good one and the problem persists. All other functions of the head appear normal. I appreciate any assistance!