Yes, thanks. That's how I understood, in terms of the best quality, maintaining the full bit depth. (Right now, I have everything set to 16/44.1, I suppose Id need to understand the advantages and any disadvantages of going to 24 bit next!)The only disadvantages of 24-bit output would be the negligible CPU load increase associated with shifting the sample data by 8 bits, plus 50% increase in bandwidth required to send the data to the DAC, which at 44.1 kHz sampling rate is no problem at all.
Regarding the benefit:
Consider a particular 16-bit sample of value ABCD (hex). Padded to 24-bit it becomes ABCD00.
Now, if you reduce the volume by 24dB (4 bits), these samples become 0ABC and 0ABCD0 respectively.
As you can see, the 16-bit sample lost 4 bits of resolution, while the 24-bit has retained the full resolution of the original signal.