MIDISynth.Command.pitch_bend

You're seeing just the function pitch_bend, go back to MIDISynth.Command module for more information.
Link to this function

pitch_bend(channel, bend)

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Specs

pitch_bend(channel(), integer()) :: <<_::24>>

Bend the pitch of notes playing in a channel. Values below 0x2000 will decrease the pitch, and higher values will increase it.