I encountered a problem with my VCI-100. Whenever I play 2 tracks on deck A and Deck B when B is master and I want to Sync Deck A and turn down the volume on Deck A it unSyncs. This happens when I turn down or up the volume. I tried this on 2 PC's. Both PC's were working without this problem for 2 years. I think it is a hardware problem. Anyone have any suggestions or happened to anyone else?