Hi Josie.

Bob's right. Even if the Emu works with the mic input, there could still be a problem with the guitar input. Two ways to check it -

1) Try another guitar into the Emu.

2) Plug one end of a guitar lead into the Emu, give it a bit of gain and stick your thumb over the tip of the jack plug on the other end. If it buzzes you've got a connection. (I'm not sure that Mac is going to like this method!)

Let us know how you get on.

ROG.