I would think a digital sample and hold module would be the ticket for this. You need a sample and hold circuit that will stay accurate for a long time.
With that, your panning position should hold until you choose to update it. Trigger the sample and hold circuit again to update the signal to whatever your current incoming value is.
-- Ronin1973
That's a great idea, thanks.
-- RelaxedNapper
The Disting Mk4 has a digital sample and hold routine. I would try there first. But you will need a CV controlled stereo panner that takes a single CV input to control panning like an ADDAC System 805 or two sample and hold modules, two VCAs, and two CV sources to control the level to each VCA to adjust panning in the stereo field. I'd go for the stereo panner. You can also find CV controlled panning on the Roland 500 series mixer or the Happy Nerding PanMix.