I connected my kit to Garageband for the first time last night using a USB cable. It works fine but so far I can only figure out how to use the kits in Garageband.
Is there a way I can use the Alesis on-board kits while connected to Garageband?
Only MIDI information is sent over the USB connection, not audio.
External audio interface is the best recommendation for getting audio into laptop or MacBook
There are multiple posts on this subject.