11-22-2018 07:36 AM - last edited 12-24-2018 23:16 PM
This is the Piano app.
It consists of only a few audio controls, rectangles and timer control.
In order to reduce the sound source data size due to playback delay in iOS, the sound uses a sine wave rather than a piano sound.
I added a recording & playback function in this app.
This function is realized using Collection and Timer control.
movie (from Twitter)