No problem, glad you got it sorted.
The audio buffer will not affect the audio bit rate, (quality) it is just a buffer to account for audio latency. The bigger the latency the more efficient it is on your CPU. The lower the latency (say you set it to 64samples) the more drain this is to the computer, hence the need for the best machine you can lay your hands in when working with CPU host reliant applications.
Audio quality is the sample rate that you work in, that could range from 44.1khz to 192khz. Again, the higher you go, the more work your CPU is having to do, also more hard disk space used for the recorded audio.
Thanks, Stuart