This setting limits the number of rings to a specific value, ranging from 0 to 999. A value of 1000 disables the limiting, and the value is displayed as "MAX" to indicate this. The default value is "MAX".
The number of rings is also limited by the canvas size. Setting Rings to "MAX" allows rings to die "naturally", i.e. when their all vertices are off-canvas. Setting Rings below "MAX" can cause rings to die before their time.
Limiting the number of rings is essential for solving performance problems, but it's also interesting as a special effect, because it provides a means of simplifying the composition.
The ring limit can be changed via the Master dialog, via MIDI, or in Veejay mode ONLY, by moving the mouse vertically while holding down the Alt key.