Difficult to decide which forum this belongs in. First off, I stumbled upon an interesting Facebook page belonging to "Hello Music" (whatever that is). Contains a lot of gear demos, as well of other topics. If you're a FB user (or not), take a looksee for yourself @ https://www.facebook.com/hellomusic

And therein lies the link to a really good demo of the Roland GR-55 guitar synth, with some excellent playing starting at approx. 1:30