Don't worry about sound issues, though. Old hybrid synths (analog generators with digital control and parameters storage) were very recognizable from fully analog ones (purely CV controlled) just because say a pitch bend mapped to a 8 bit sampling of a potentiometer, which translates to 7 bit up and 7 bit down, wouldn't have the minimum quantization to let the listener perceive it as an analog control. Today cheap MCUs allow adding digital control to analog generators, filters, envelopes etc. to a granularity level (16+ bit) so that any realtime variation would be identical sound wise to a fully analog controlled synth. Latency wouldn'b an issue as we're talking about control and not sound generation: MCUs with no or minimal (realtime) OSes would never impose such higher latencies as in virtual instruments etc. Having an ADSR kick like two milliseconds after the key is pressed would hardly be a problem.