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The main thing I wondered is the step size. 256 .5 db steps is 128 db which is more than enough. Even .25 db steps for 64 db would work for almost anyone's system.
I have made my own in several configurations. 1 db steps are as good as a continuous control. So smaller steps are only helpful for matching two different devices precisely in volume. Which normally is not any benefit. One I made had 7 resistors in something like a ladder DAC configuration. 128 steps that were plenty small. I just had 7 switches one for each resistor to ground. I used it enough I could just flip the switches and get the volume I wanted. For someone not familiar it would have been baffling to use. These modern ones take care of all that for you using relays.
I have made my own in several configurations. 1 db steps are as good as a continuous control. So smaller steps are only helpful for matching two different devices precisely in volume. Which normally is not any benefit. One I made had 7 resistors in something like a ladder DAC configuration. 128 steps that were plenty small. I just had 7 switches one for each resistor to ground. I used it enough I could just flip the switches and get the volume I wanted. For someone not familiar it would have been baffling to use. These modern ones take care of all that for you using relays.