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Ladder VCF Kassutronic's KS-20 https://kassu2000.blogspot.com/2019/07/ks-20-filter.html ** uses an LM13700 OTA (operational transconductance amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ based on https://www.analog.com/media/en/technical-documentation/data-sheets/199399fc.pdf TO-92 2-pin variant by Heraeus, drill 0.75mm (see NXP sot054_po.pdf TO-92 leads in-line, narrow, oval pads, drill 0.75mm (see NXP sot054_po.pdf TO-92 leads in-line, narrow, oval pads, drill 0.75mm (see NXP SSOP-TSSOP-VSO-REFLOW.pdf and sot556-1_po.pdf 24-Lead Plastic QFN (2mm x 2mm) (see Linear Technology DFN_12_05-08-1695.pdf DF Package; 12-Lead Plastic DFN (5mm x 4mm) (see Linear Technology DFN_16_05-08-1732.pdf DHC Package; 18-Lead Plastic DFN (4mm x 3mm) (see Linear Technology DFN_12_05-08-1725.pdf DE/UE Package; 12-Lead Plastic DFN (7mm x 4mm.

It can be replaced.
(JEDEC MO-194 Var AA.
Connector, S06B-XASK-1N-BN (http://www.jst-mfg.com/product/pdf/eng/eXA1.pdf), generated with kicad-footprint-generator.

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