У вашего броузера проблема в совместимости с HTML5
Update: https://www.youtube.com/watch?v=fVsqwGPzIaY
Resuscitating an old version of the famous Steinberg's Cubase sequencer.
Cubase 2.0 was released on 1990 . This version had no audio features, only midi, and worked fine on the old Atari STE 1040 I owned years ago.
Here we can see it working again on the Atari emulator Steem, that helped me recovering old musical material I composed.