This is a MIDI sequencer(player) with playable keyboard.
You can download mid file from web. zip archive is available.
Tempo: 0.5 to 1.5 (variable)
Key : -1octave to +1octave (variable)
Instrument: Auto and Manual 84type
In case Auto setting, it is assigned according to Program Change event in the midi file.
Max oscillator:16, 20, 24, 28 (selectable)
28 is recommended.
When you feel heavy, reduce this number.
Each channel is mutable.