The Grand Master slider is the final intensity master before values reach DMX hardware

The Grand Master sits at the end of QLC+‘s signal chain: all computed DMX values pass through it before being written to the physical output. By default it affects only Intensity-type channels, but can be configured to affect all channels. Two value modes: Reduce (scales affected channels by a percentage) and Limit (caps channel values — GM at 127 means no channel can exceed 127). This makes it an emergency safety valve and a show-control master fade simultaneously. Grand Master does not affect passthrough data.

Examples

Setting Grand Master to 0 produces a soft blackout without changing any function states. At GM=50% Reduce, a channel set to 200 by a Scene outputs 100. At GM=127 Limit, that same channel outputs 127.

Assessment

Distinguish the Reduce and Limit Grand Master modes with a concrete example. At GM=50% (Reduce), a channel is set to 200 by a Scene — what value reaches the fixture? At GM=127 (Limit), same scene — what is the output?