I just purchased an Alesis SR18 and a Boss FS-6 footswitch. On patterns I programmed, when I press the "B" footswitch, the sound stops until the loop begins again and then what I programmed starts playing. This doesn't happen with the built in patterns or when I use the buttons on the unit. Only with the footswitch on my patterns. I must have changed a setting as I have erased and re-recorded the patterns with no change. Any ideas?