Click on the note you want to play or use the A W S E D F T G Y H U J. Use 1-9 to change instrument. Use X and Z to change the length of the note. Use left and right arrows to change the octave. use the slider to speed up or slow down the metronome. click the metronome to turn it on and off. only you can hear the metronome, but everything else anyone can hear
thanks to @ammong for the idea.