Expert Sleepers OSC Control v1.0.0 - Manual (Page 7)

/startNote i:note f:velocity
Starts playback of a note - equivalent of a MIDI note on message.
‘note’ is the MIDI note number; ‘velocity’ should be between 0.0 and 1.0. E.g.
/startNote 60 0.7
/stopNote i:note f:velocity
Stops playback of a note - equivalent of a MIDI note off message.
‘note’ is the MIDI note number; ‘velocity’ should be between 0.0 and 1.0. E.g.
/stopNote 60 0.0