The 'alternate tunings' feature is very specific in the position of the slider.

Part of the prob I had was beI could hear the strings in normal tuning as well as the 'alternative' which made it sound 'odd'

As I mainly play in DADGAD or Open D then I tuned the guitar rather than use the tunings option and it seemed OK.

Having said that, I've not heard of anyone else having this prob
G-P