Darn expensive and it takes knowledge to implement. I will stick with "el cheapo" 21 -23 stepped attenuators from eBay. Thanks.
My recently purchased 50K DACT CT2 sounds markedly better than the cheap ebay offerings, where the channels are much closer together physically than the DACT CT2 due to the type of rotary switch used. Not only does the DACT CT2 have far better HF separation then the ebay offerings, but there is a fair chance that it's HF channel separation is superior to this physically large 64 position beast too.