Yes two button works fine. Only downside is it looks like there will be a delay before that new paddle with 6 foot switches is out. Ought to be really sweet though when the six button arrives. I bought the head from Sweetwater at $750 which was a great deal.
Recently purchased the DSL 100 HR head. Really love the app but it has a noise that sounds like a bad preamp tube. Kind of that soft noise in the background that you will recognize when you have a bad preamp tube. I have changed each tube to no avail. Has anyone else noticed this on this app...