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RC4 Glossary
inverted linear

The inverted linear curve works backwards, with the highest level being off, and the lowest level being full.  If two dimmers are assigned to the same DMX channel, one set to linear and the other set to inverted linear, they will cross-fade as the channel level changes.  (Note that in this case it is not possible to turn both lamps off.  To overcome this, separate DMX channels would be used.)