Region off group.

When a new region with a group number equal to off_by plays, this region will be turned off.




This is used in conjunction with group to make things monophonic, but can also be used in other contexts where one sound should cause another to stop - for example, cymbal chokes.

Practical considerations

With the default for both group and off_by being 0, any instruments that leave these default values in place should in theory be monophonic. As a workaround, rgc sfz, Cakewalk players, BassMIDI and LinuxSampler implement special behavior where if group=0 and off_by=0, regions are not muted, and muting only happens for non-zero values of off_by. ARIA/Sforzando has a different workaround, with the default value of off_by being 4294967295.

The actual minimum and maximum values are not currently known. Some players will treat numbers outside a certain range as equivalent to off_by=0, and ARIA/Sforzando will also do this with text strings. The behavior of non-integer numbers is also currently unknown. This makes it possible to use an extremely large number for one group/off_by combination, but it's obviously not recommended.

Name Version Type Default Range Unit
off_by SFZ v1 integer 0 -2147483648 to 2147483647 N/A

Category: Instrument Settings, Voice Lifecycle