We need to make the virtual instrument play! (animation project)

We need to make the virtual instrument play! - make the virtual diatonic accordion play wave-files while reading information out of midi-files - make these things working: 1.) buttons outside the play/stop bar for step-by-step-learning, bird's-eye-perspective of diat. acc., tempo scale , On/Off-Switch for left- and right-hand 2.) play/stop bar 3.) transposing the song after selecting the tonality 4.) changing the model and type (other picture of musical instrument) and change the song-file, which is written for the selected model/type Best regards, Nino Jamnik