a7r: We support 10.9, which is presently two versions of the OS out-of-date. That's pretty darned good, I'd say. We won't be going back farther than that, I'm afraid.

anonymous: I can't say I see that mentioning Loopback on the Soundflower page "suggests more casual use". Soundflower is used by many folks in a professional capacity, folks who are often stymied by its confusing nature or lack of reliability (see http://lifehacker.com/loopback-for-mac-manages-multiple-microphones-and-other-1752724668 for instance). If they're looking for a more reliable solution, we want them to find it, that's all.

As far as Audio Hijack goes, Loopback is not something we plan to incorporate into it. Audio Hijack is aimed at capturing audio to record (saving to a file) or adjust (with audio effects), while Loopback is a tool for passing audio between apps. They can work in conjunction, but neither is likely to absorb the features of the other. We made this a distinct app specifically because it's not functionality most Audio Hijack users need.