Add full duplex so I can record my own playing or singing while listening to a theme and then add the recording to the theme.

This would increase the value of the app enormously, because if you're sensitive to sounds, you're usually also sensitive to and interested in music. I don't mean that Halotea should be turned into a sampler, but as it already is a loop player and I can create my own loops, I think that I should also be able to create them in sync with the rythm and mood of a theme.