I was thinking about getting a drum machine in order to liven up my solitary practice sessions. There seem to be a few hundred of them on Ebay at any given time. Exactly what kind of outputs do these things typically have. RCA type stereo connectors, XLR, or 1/4" instrument type connectors. Say for example an Alesis, or a Boss 770 or 550. I use an SWR Workingman's 12. Could a drum machine just be plugged into the effects loop input or do I have to run it through my stereo receiver like an audio component? Thanks!