It's stunningly easy to create a demo. I am a professional musician and I was able to create a fully multi-track recording to send to one of my writing partners in Nashville. I did it in two hours with a guitar and my phone. What I sent him was a fully track with, lead vocals, harmony, bass guitar, rhythm acoustic guitar, electric rhythm guitar, electric lead guitar and hammond organ. I played a freaking hammond on my phone! and it sounds very decent. I'm consistently blown away by how Apple has thought out the interface and the features of this app/program.
I don't play drums at all but the virtual drummers in the software do an amazing job and you can control so much of what they do. For demoing it's perfect. I really couldn't ask for more.
I recently used it to track a live concert by my band. The Whiskey Rebellion. We had the band running full into a PA I was able to take a single XLR feed, plug it into my PHONE and track the entire show. Pretty incredible.
I'm not even sure this is a complaint because with a lot of features comes complication but if there was any way to make the learning curve a little less complicated that would be ideal. I know that true audiophiles are harsh on some of the plugins and the limitations which I get BUT it's made for recording demos!
It's the PERFECT app for quick demos. Try it out!
I am able to track and record live shows and demos with GarageBand to send to writing partners. My bands have shown up with songs learned perfectly because of this app.