Polyphony limit for playing the same note repeatedly.
Under default voice stealing behavior, this is not a “hard” limit because lower-velocity notes do not mute higher-velocity ones. It can be changed to a hard limit using note_selfmask. Limiting note_polyphony is useful for controlling both the sound buildup and resource usage on long-ringing instruments such as piano with the sustain pedal pressed down or hammered dulcimer. An alternative for those use cases is using ampeg_release with off_mode set to normal.