Mine sounds decent, and I know some other members here have the IVP as well. Others have sold theirs after numerous tries and not being happy with it. There is a thread here called "Let see some Bobby Rigs"...you can see what others have used/tried for settings in the pics. As far as the Tube or Clean voicings...Ive seen pictures with Bob's on either one, so its up to you. Though I think he used the Tube more often.