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I believe what @restorer-john had in mind is using the output pins of this 10 bit chip to turn relays on and off. You have a relay on each output pin, feed a DC voltage thru a linear pot, giving fine control of the voltage fed to the ADC, and have the ADC sample that voltage. Turning the pot up and down switches the relays on and off giving you the effect of a plain volume control knob. If you have arranged the relays to control an R2R set of resistors you get a very nice volume control. But none of this is in the signal path. It only controls the relays. A very neat idea he had. Very neat.An interesting approach, but I'm not quite ready to tackle PCB layout for A/D & D/A chips. If it can't match or beat the performance of the Topping D50s, I don't want to put it between my DAC and transducers. I admit though, I have long term fantasies of building my own AK4499EQ implementation, or whatever the "top of the line" is if I ever get to that point.
Alas, neither my own skills or home electronics laboratory are quite up to the task yet.
https://www.ti.com/lit/ds/symlink/tlc1551.pdf