First, wow, I didn't expect any HN readers to actually know about, much less have bought, my work! Thanks.

Second, I understand your frustration. I love building things, and sometimes I wish I could do that full time, but grad school is a 70 hr/wk commitment for me.

If the app is not useful for you without the missing feature, Apple does allow returns. I'm not quite sure how it works, but I see a few returns a year on my reports.

Also, I've open-sourced the hardest part of the app, the audio managing aspect, as Novocaine (GitHub.com/alexbw/novocaine), and along with the great package NVDSP, anybody could replicate the basic functionality of my apps with a few weeks of learning and effort. It'd be great for the audio app ecosystem, too!

I'm also interested in hiring a part-time developer to help flesh out the top-requested features, if anybody has ObjC coding experience. That'd make many more updates possible.