Hi Hendrik > Woh... I don't think my 'expertise' stretches that far. My > guess would be that it's "obvious" that Logic dithers to 24 > bit, but that's just based on... well, nothing much really > :). My intuition would say something like: if you use an I/O > plug-in, the external gear surely gets the audio delivered in > a useable format (I hope), which means 24 or 16 bit. Well Logic certainly 'delivers' audio in a usable format (16 or 24bit fixed point), I have no problem with that. The issue I was trying to get to the bottom of is 'how' it gets to that final format. ie. if all it's internal processing is at 32bit float, how does it convert to a lower, usable, fixed bit depth? My concern is that the mixer simply truncates at the output stage, unless one specifically adds dither as the final process in the mixer. Common sense would seem to me to suggest that all outputs should be dithered by default because, as you rightly point out, no hardware (ok I'm generalizing) can work with 32bit float files, and therefore bit depth will always have to be reduced as audio leaves the host environment. My concern is that this does not necessarily take place. I think I'm right in saying that ProTools offers a choice of either a dithered or undithered mixer, which seems to make sense, and is certainly what the pro market it's aimed at would and should demand. IMHO Logic should also be offering this same functionality. Indeed it may already dither all signals by default, I just can't find out whether it does or not. If it doesn't, then I would choose to add dither manually to every output bus, but I don't want to do this if it's already being done discretely, for obvious reasons. So many of us are insistent upon using the best converters, the highest resolution plugins, the highest bit depth and sample rate etc. and yet this issue rarely seems to surface. I guess many people are now mixing entirely in-the-box, but a lot still use mixers and/or 'real' outboard of one kind or another, and I would have thought this was fairly fundamental. Oh well, maybe a passing developer might like to shine some light and put us out of our misery!! Jules