Paul, thank you for the answer. You write "It’s aimed at a smaller group of largely professional users, for whom it should definitely be worth the slightly higher price." But at the same time, text on your Soundflower page says "If you've previously used Soundflower, or are simply looking for a tool to route audio between applications on your Mac, you may be interested in Loopback." which suggests more casual use -- exactly my case. I simply need to occasionally send audio clips via Skype or other teleconferencing systems. I can continue using Soundflower, but Loopback surely looks nice :) (Maybe Audio Hijack can get this feature too, without using Soundflower? :))