Assertion: middle pedal | /r/HasProperty | the one on the left
Facets:
value: except slides into a groove
type: OTHER
value: on the left
type: LOCATION
value: often
type: TEMPORAL
Source sentences:
text: Often an upright's middle pedal is another half-blow pedal, like the one on the left, except that the middle pedal slides into a groove to stay engaged.