Both great suggestions and both already planned!
V1.5 will have volume control of video and metronome audio.
I play with the Handy and never realized how strong the beat audio tends to be with respect to the video. v1.4 has a small mitigation I introduced last minute but v1.5 will have the full solution.
Folder of videos/video library will be necessary for the tournament mode in v2.0. Might get implemented as a basic version before and then enhanced in 2.0+. Depends on a few things I want to iron out first.
Thanks!
