Independent gain/trim adjustment for stereo channel

Is this possible? Just noticed one of my synths is a bit hotter from the right than left channel (after many different cables/di boxes. Can set the gain on the inputs to compensate with two mono channels, but as soon as I pair them, they share a setting.

I saw another thread that dealt with a variance in pad settings but that’s not the issue, it’s definitely the source that just needs slightly adjusted trims.

I’d use input ganging instead of running it as a stereo channel

I like the Yamaha way of doing this (it is on the LS9 at least - not sure if the same on their newer consoles) where faders and gains can be set seperately when unlinked and then maintain that offset once linked. Very helpful sometimes, more so for the gains than the faders though.