I can help out here. I have used Dan's vArranger on live gigs often. I use a Roland A-800Pro controller with various control buttons and sliders setup to do just about anything I need for a live gig without ever having to touch the laptop on which vArranger is running. It works pretty much just like a normal keyboard. I have run vArranger on Windows 7, Windows 8, and also running Windows 7 on my MacBook Pro. It all worked just fine.

Deane