У вашего броузера проблема в совместимости с HTML5
Tutorials By Arun.S.Son I think this transpose technique works in every M-Audio Keyboards and workstations Step: Transpose works similar to octave shift, except the shift is not limited to multiples of 12 semi-tones. As with octave shift, there are two ways of transposing the keyboard. When in Edit mode, you can assign the Octave Greater than and Less Than buttons to control the transpose feature. Alternatively, you can use the black keys F#3, G#3, and Bb3 to shift the transposition. These black keys represent TRANSPOSE -, TRANSPOSE 0 and TRANSPOSE + respectively. fb: https://www.facebook.com/arunsson/