No I'm not storing anything else... I think. I'm not at home at the minute but when I am I'll post the code I'm using. It's pretty basic compared to what's possible I'm sure but I've been learning as I go along. 
Thanks for taking the trouble to put that bit of code together. I already have a load of momentary buttons and a couple of pots so if we can get it working that makes it easier for anyone who wants to do something like this themselves.
Alright it's a bit niche but you never know. 