ALLO RELAY ATTENUATOR Volume Relay Attenuator for Piano DAC and Boss DAC - reviews - There are 3 reviews.

Addendum
..in clicking away from the page, I noted that the resistors are susumu. If that is indeed the case, they have a very good reputation for noise

Looks good
I have yet to wire the device in, but it seems to have a good build quality. I brought it in order to connect to a pi. It isn't going to be just a plug in, but equally a pretty simple lash up of power and i2c. I found The documentation less than clear, but in reality all those connectors are just pass through, so 4 / 5 wires should do it. A true audiophile would reject those SMD resistors, but for me a better that 100db signal to noise ratio is more than acceptable. I note the other advice here on popping when changing levels. This is a general problem with switched ladders, but I note that the Dutchman whose design is almost identical to this one has an algorithm for reducing the intrusiveness .... All I need to do now is compare his solution with that used for this board

Does its job with some limitations
It works pretty well if volume changing is done gradually 1 step at time.
Increasing volume of many steps at once generates a "pop" noise on the output.