What is a Rader Matrix?

travisbmartin

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So today I was trying to figure out why my Mario Bros. game isn't giving me any digital sound after I had replaced the three VCOs and chips 5L and 6K, which seams to solve most problems from the forums.

Poking around with my scope, I seem to have a signal until I get to MXR1. The manual I have lists MXR1 as a "Rader Matrix 10K Ohm x 20K Ohm"

What is this thing? I can't find an explanation or a replacement anywhere. I'm thinking either this is causing my lack of digital sound, or the LM3900 Audio Amp the signal goes to next.
 
Replaced the LM3900 today and still no sound. One last bump to see if anyone knows anything or a replacement for this MXR1
 
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