So, getting an AVID interface to get hold of a cheap version of Pro Tools seems like a decent option, but as I'm using FL Studio Mobile, I guess I should give FL Studio a go.
So I downloaded it and plugged in my controller and had a few notes playing. Then I tried playing a few of the sample projects and instantly hit problems - nothing played back cleanly. Now I have had some problems with my laptop with mystery HDD issues, but it didn't seem to be playing up at the time.
I played around with the version a little, somewhat limited by the fact you can't save. And while it seemed OK I wasn't bowled over. So FL studio is a possibility, but I'm not quite ready to shell out on it just yet.