I can't seem to find a mention on -devel, but I note in MixerToolBar.cpp
1.15 that you changed on the 23rd November "Update Audacity's input
source in the Mixer toolbar if the source is changed outside of Audacity."
Was this to address this P3? It doesn't seem to work for me on XP in
rc1, testing swapping in/out with a USB sound card and USB turntable.
I haven't tried on Windows 7 because I have still have very limited
access to that.