Hi- I'm a new user of Logic X and have been recording with a Focusrite Scarlett 2i2, recording acoustic guitar and vocals. Now, i've switched to a Scarlett 2i4, which has MIDI interface, and I can't get any sound back, either when I play projects recently recorded on the 2i2, or a new vocal track I've just recorded on the 2i4. The audio on my macbook is fine - I'm able to play stuff from itunes. But, thought I'm recording I can't get any sound back. Can anyone help me? Thanks!