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You're right. I suppose you'd need a reference voltage and a comparator per output to make it an ADC.

-- theneweuropa

Much more than that. Analog to digital conversion is complex and is usually handled by a dedicated chip. For discrete implementation you would need either 2^n-1 comparators where n is the number of bits (eg 255 comparators for 8 bits) and a string of 2^n resistors plus a complex network of data encoding gates, OR a complicated state machine that performs a quick series of measurements with a set of thresholds per each input sample.

There are analog implementations of ADCs in Eurorack in the form of R-2R resistance ladders. Equation Group by Wildfire Laboratories is one example.

-- theneweuropa

R-2R ladder is a simplified implementation of a DAC, not an ADC. So this could be a substitute of the right side of Drezno, not the left side.

Also note: the original Batumi takes +45mA from +12V and only 15mA from -12V. This ripoff takes more than twice of that.