I had a Wadia 830, and called Wadia with the same questions. On the 830, they are dip switches inside. They faxed the instructions to me. You should do the same. It was very simple.
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you found the right switches (there should be two sets of them (as you indicated 4 per ch), side by side). call audio video research at (734) 975 4217 (that's the direct dial for their service manager). or try matt bastion at (715) 425-6000 (he joined avr from wadia). either should have a copy of the 3 page instructions to fax to you.