I just bought the SR18 for our Church Praise Team. I play drums, however, I am wanting to play some guitar on certain songs and we do it have a back up drummer. So I thought this might be the answer. However, I am not understanding how to change the time signature. For instance if I am working with Rock 31 U24, it's 4/4 time. Is it possible to take that and make it a 6/8 or 3/4? Why couldn't Alesis just have a section under edit that had the time signatures and you could just switch beteeen them. The manual doesn't help at all. Any assistance appreciated.