Late last season, I'd asked for a "brightness" adjustment, not for the whole model but for each channel in the model. A slider or +/- adjustment (in the green column I added to my picture).
The reason I asked for individual channel adjustment was that I added 2 more TM1804 strings from Ray (#9 and #10) and they were one year newer than #1 thru #8 and were noticeably brighter. I found no way to adjust so I lived with it.
But I can dream.
An even bigger dream would be a +/- for R and G and B to help color match replacements and additions. Adjusting all 3 the same amount would be the same as a single adjust.
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