I am using a Carvin BX1500 with a small pedal board that includes VT Bass, Pitchblack tuner and Boss GEB7 eq. The cab is a fEARful 15/6. In the third set we heard a loud "beep" sound. We thought it was the PA so I made adjustments. However, a few moments later it happened again. Then became a steady beep. It was very loud and annoying. Especially when we had the dance floor full and people waiting. Ugh. I shut the PA completely off and it still happened. Obviously not the PA! Then I realized it was my rig. I shut it off and then plugged straight into the BX1500, bypassing the pedal board. After that everything was fine. I have been using that pedal board arrangement for quite a few months and have never had this problem before. I'm just wondering if anyone could shed some light as to what may have cause the noise so I can take steps from it happening again. Loose connection perhaps?