GtkAdjustment mostly just mimics the signals from its source widget. Regardless, I had perfect luck with HildonHVolumebar's "private" children. It's a very clean, if not naughty, solution, but it now works exactly like the sound applet. It's so simple you might sh*t yourself. If need be I can give an explanation later, for the time being I'll let the code I included speak for me (I'm burnt). I haven't hooked the beep to the mute button yet, but here's a demo; It's working very well. Even though nothing bad is likely to happen, please don't use the following unless you know how to fix your tablet software when things go wrong