This is Trombone.
I made the application assuming that the app play with Surface Pro.
*I don’t recommend playing with iPhone due to playback sound delay in iOS.
movie from Twitter
Play Music (with @artbreak_taichi)
https://twitter.com/ishiayaya/status/1203271149167112192
[control]
This app uses Drag & Drop method developed by @10mikiya.
https://qiita.com/tomikiya/items/591a7b3d69c70d56c70f
(Sorry in Japanese)
[material]
I use the free trombone sound file obtained from the website below (University of Iowa Electronic Music Studios).
http://theremin.music.uiowa.edu/MIS-Pitches-2012/MISTenorTrombone2012.html
Play fun!!