I need some way for the user to control the timing between two relays switching on , I require 4 such pots to control timing at different step of the process.

I thought of a digital counter , with 7 segment display and increment decrement button and a menu to navigate to each of the four process settings, but the issue is the setting cannot be one as finely as using a pot.

I even thought of using 2051's analog comparator for this, there are two problems
1. I cannot control simultaneously 4 settings
2. I need to build a comprehensive lookup table for the timing.

Any suggestions ?

I am just looking at mc14541 , I found it in a burnt up star delta timer.

Thank you
Deepak