The idea of it is really quite nice, the implementation however is underwhelming imho.

The notes need to happen instantly...they do not, the lag between clicking + the actual sound is horrible.
We need to be able to use in macro!! Not only to free our hotbars up but to be able to assign even some degree of control over the tempo between notes etc.

I thank them for adding a feature but unfortunately ..it already feels antiquated, cumbersome and in need of drastic change.