Further information:
I have a set of this high quality volume control kit bought from Japan, brand new.
http://akizukidenshi.com/catalog/g/gK-06469/ for more info.
Muses72320 is a good quality volume control ic as compared with pga2310. The set require a dual opamp for output buffer and you can roll the opamp, it comes with a jrc dual opamp.
Photos:
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