How do you increase buffer size?

I asked this question on numerous other threads but never received an answer. I just purchased an Audiophilleo 2 (which I thought was a plug-and-play device, but doesn't work. Perhaps because I need to download a certain software for that version?). Anyway, I bought/sold two other usb/spdif converters in the past, both of which made "clicks" and "pops" when playing music. I was told increasing buffer size would fix the problem. I couldn't figure out how to do that and still haven't received an answer.

So, my question is twofold:

1) How do you increase buffer size?

2) Does that need to be done with the Audiophilleo 2?