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BackVia skywiring; only one tl074 and support Kassutronic's KS-20 https://kassu2000.blogspot.com/2019/07/ks-20-filter.html ** uses an LM13700 OTA (operational transconductance amplifier) (~$1.50.
- Vertical, ACP CA14V-15, http://www.acptechnologies.com/wp-content/uploads/2017/10/03-ACP-CA14-CE14.pdf.
- To standardize the display.