On Wed, Aug 27, 2008 at 03:00:50PM +0200, Reimar D?ffinger wrote: > On Wed, Aug 27, 2008 at 01:21:38PM +0100, M?ns Rullg?rd wrote: > > Lowpass filter with a cutoff of 30-40 kHz. Nobody will be able to tell > > the difference. > > But their dogs might! :-P You've meant bats and dolphins, haven't you?