“STG Soundlabs Post-Lawsuit Filter. Very rare Frac Rack version of this module. Filter is working but has quite a bit of bleed-through when fully closed. There are trim pots on the board for calibration, but I could not get a response from STG with regards to the correct calibration procedure. They have been very helpful to me in the past, so maybe you will have better luck contacting them. In any case, If you are handy with an oscilloscope you should be able to sort this out. “ Click here to visit listing on eBay
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