I have a 7 year-old Yamaha Portatone 220 with full size, touch-sensitive keys. It has a midi interface.
I know I'll be able to record with it using the line in on my Mac (audio recording, like with a guitar), but it would be nice to take advantage of GarageBand's MIDI features. How do I connect my keyboard to my Mac? Do I have to buy some sort of USB device with MIDI ports in it? How much will that cost? They are selling that new USB midi keyboard for £69...