From what I understand the DAC takes a bitstream from your 44.1 / 16bit player and upsamples / re-dithers to 192

Dither has nothing to do with sample rate. To understand what happens when you up-sample from 44.1 to 192KHz, see below...

Imagine having a pizza cut into 8 slices. You could cut those 8 slices into 4 new slices each, for a total of 32 slices per pie.

Not quite... Most - if not all - SR conversion algorithms don't just copy the samples, but take the relative level of contiguous samples and the rate of change of the signal around those samples and mathematically calculate interim values for the extra ~3.35 sub-samples. And because 44100 is not a multiple of 192000,

*even your original samples get re-calculated!* It's like replacing every single pizza slice with "fake" slices that look like pizza, but are really computer-generated plastic mock-ups...

Now, no algorithm, no matter how advanced, can guess what was

*really* happening to the original analog signal between two samples, after it has already been sampled. Up-sampling algo's can only try to "guess" what the in-between must have looked like, with no way of checking. And up-sampling does not necessarily let you use a gentler smoothing filter after D/A!

And Bouncing to Disk in PT is probably the worst thing you could do to a mix.

This is true, but slightly inaccurate... The result of a digital addition (like with "regular" decimal addition) is

**always the same**. In other words, a sample with a hypothetical value of 2, added to another sample with a hypothetical value of 2, will

**always** result in a new sample with a value of 4. But read on...

Like Rochey said, the precision of the processor doing the adding does determine the precision of the resulting samples, and by extension, the quality of a digital mix. It is the Digidesign

*hardware*, rather than ProTools, what determines the precision of mixed samples.

In other words, bouncing to disk in ProTools will give you the same result as bouncing to disk in, say, Logic,

*provided you use the same hardware to do the mixing.* If you're using ProTools LE, which doesn't rely on on-board hardware DSP, the precision of your mixed down samples is determined by your computer's internal FPU.

And then there's some RME card that has something like 84-bit floating point precision!

Anyway, I'm getting dizzy...

Peace,

Al.