I made a post on 6/7 about the excal sensitivity. I mentioned that my excal would make a warbly sound. Today, while playing around with machine, I noticed that when I straightened out the headphone cable the warbly sound would go away. Sounds like maybe the cable is trying to give out. How hard is it to replace the headphone cable at the control unit, do I just remove that part of the control box and don't need to touch the other side? Where can I get the parts to fix it, maybe putting in a connector so I can use different kinds of headphones? thanks for any info. John