Joins an array of voices to a comma separated string in reverse order.
Needed to make the top voice (0-indexed) stay at the top when rendering on a Piano (right hand).
Parameters
voices: string[][]
The array of voices (e.g. [["G3", "B3"], ["C3", "G3"]])
Joins an array of voices to a comma separated string in reverse order. Needed to make the top voice (0-indexed) stay at the top when rendering on a Piano (right hand).