Ahh the good times I remember designing and building some configurable audio crossovers with “memories” so they could be adjusted and stored. This was of course

Ahh the good times I remember designing and building some configurable audio crossovers with “memories” so they could be adjusted and stored. This was of course before DSPs were even a thing. We gave up because the only solutions were inserting mosfets on the opamp loop or using transconductance opamps. Both solutions were terrible in terms of audio quality, we decided for “cartridges” that were the whole x-over stage.