what are they?? ive seen them on the Randall MTS combo's
In addition to the speaker out, you can run a cable from the slave out into the input of another amp.
Its so you can have multiple heads - like Metallica do in live shows
so basically you can hook up a cab and an additional amp?
well basically the slave out goes into the input of another head (i think anyway) and you can add more and more heads etc etc.