ydirection -1 force stem down \stemdown
ydirection 0 stem direction free \stemboth
ydirection 1 force stem up \stemup
+pletvisibility 0 show nothing
+pletvisibility 1 show number
+pletvisibility 2 show number, and bracket-if-no-beam
+pletvisibility 4 show number, and bracket
[Score?]
beamslopedamping 0 no damping \beamslopeproportional