I have just bought an alesis dm5 electronic drum kit. It has a midi out and I want to use it with GarageBand and I want to use GarageBand's built in VSTs. I have bought a midi to usb cable/interface (£3 off eBay). When I plug it in, A message pops up that GarageBand has recognised an input. But when I tap the drum kit, nothing. I have tried changing pretty much every option on the drum module (channel? thru?) and still nothing. Can anyone help? Also, there are lights on the midi to use cable thing, a red light comes on but the lights that show midi in or out do not come on.