Well it's doing something then Colin. Maybe only visual. grin Or it may be heard with acute hearing. Thanks!

Yeah Joro, that's my basic understanding of dither (adding noise to the digital audio to basically reduce distortion in the lower value sine wavs......). My understanding is that it would improve a 16 bit mp3 made from a 24 bit wav (though I don't hear it). Thanks for your input.

Best, John smile