I have the same problem too. It worked on 1.03 and never works with 2.0 b3. Allso it's a mess with sources on my MK1, tuner and aux (with is not currently on use) they doesn't make sence. I have made some posts on this issue in other tuner related threads. Not mentioning the source button because i thought it starts working when they clear up the mess with tuner and aux..