There were an older era of "analog" audio recordings, produced in the old "waveform", analog audio computer application program, "Audacity". They were functionally supported by a "metronome", a "click track" or a "rhythm track". With a lot of concentration and some luck, a performance could be produced that would satisfy pianists, critics and teachers. The metronome needed to be used to set the basic tempo, but if it were doubled in speed to correspond with the smallest "note" value in a piece (an eighth note in a 6/8 example piece with longer/bigger quarter notes and dotted quarter notes, a typical...