On Sun, Aug 12, 2012 at 04:00:47PM +0200, Tom Gundersen wrote: > You have showed that it is unnecessary in one particular (very simple) > case. However, you have not showed that it is unnecessary in all > cases, so this is not really relevant (had we been talking about a > human doing this, you'd have a point of course). I suspect that mathematical thinking is not your thing - no problem. For otherwise it would be clear that the 'simple' example I provided covers the general case. Let me try again. I write a PA-aware sound app X that * always sets its volume to 0 dB (max). * always outputs silence (zero valued samples). As soon as that app runs, PA will set the master gain to 0 dB and use software scaling on all other apps. Now there are two possibilities: * Either everything is OK (it will be), and we have shown that you can always leave the master gain at 0 dB, * or everything is not OK, and we have shown that PA fails. Ciao, -- FA A world of exhaustive, reliable metadata would be an utopia. It's also a pipe-dream, founded on self-delusion, nerd hubris and hysterically inflated market opportunities. (Cory Doctorow)