Amplitude for the specified region in percentage of full amplitude. Range is 0 to 100. Default is 100 - 100% amplitude meaning no volume change is applied to the sample when played. Can be modulated with MIDI CC.
amplitude=12 amplitude=40 amplitude_oncc108=100 amplitude_oncc50=35
When modulated by MIDI CC, this is a very convenient way to set up a volume control which goes from silence to full volume.