The download is just a linear PDF. Check if you have Acrobat reader installed on your Mac.
Basically if the buffer is too small, it can run out of data so you will hear distortions. The bigger the buffer, the more data is cached so processor/DAC never runs out.
Basically if the buffer is too small, it can run out of data so you will hear distortions. The bigger the buffer, the more data is cached so processor/DAC never runs out.