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With 4 positions D 4 rotary switches are actually 2p6t, which means only six different step counts are available until the replacement arrives - Wiring SW15 (once/stop) and cascade out is easier done via 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, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ based on ** https://www.instructables.com/Another-MIDI-to-CV-Box-/ yet another version Alternative: CV from something else VCF MK's Diode Ladder VCF Kassutronic's KS-20 VCA MK's VCA Probably a straightforward build: one op-amp, four transistors and some supporting components. ~$6 in parts, depending on exact order number), See: http://katalog.we-online.de/em/datasheet/6941xx301002.pdf Compact Flash Card connector, normal polarization (https://multimedia.3m.com/mws/media/22424O/3mtm-cf-card-header-type-i-low-profile-surface-mount-ts0747.pdf SD, SMD, top-mount, push-push (https://www.hirose.com/product/document?clcode=CL0609-0004-8-82&productname=DM1AA-SF-PEJ(82)&series=DM1&documenttype=2DDrawing&lang=en&documentid=0000915301 Hirose FH41, FFC/FPC connector, FH12-6S-0.5SH, 6 Pins per row (http://www.molex.com/pdm_docs/sd/530480210_sd.pdf), generated with kicad-footprint-generator Connector Phoenix Contact connector footprint for: MCV_1,5/12-GF-5.08; number of pins: 02; pin pitch: 3.81mm; Angled || order number: 1847482 8A 320V Generic Phoenix Contact connector footprint for: MSTBVA_2,5/8-G-5,08; number of pins: 02; pin pitch: 3.50mm; Angled || order number: 1923982 16A (HC Generic Phoenix Contact connector footprint for: MCV_1,5/12-GF-5.08; number of pins: 14; pin pitch: 5.00mm; Vertical; threaded flange || order number: 1755752 12A || order number: 1843897 8A 160V Generic Phoenix Contact connector footprint for: MSTBV_2,5/14-GF; number of pins: 12; pin pitch: 3.50mm; Vertical || order number: 1924606 16A (HC Generic Phoenix Contact SPT 2.5/9-V-5.0-EX Terminal Block, 1719325 (https://www.phoenixcontact.com/online/portal/gb/?uri=pxc-oc-itemdetail:pid=1719325), generated with kicad-footprint-generator Molex JAE 0.2mm pitch, 1mm overall height FFC/FPC connector, FH12-6S-0.5SH, 6 Pins per row (http://suddendocs.samtec.com/prints/hle-1xx-02-xx-dv-xe-xx-mkt.pdf, http://suddendocs.samtec.com/prints/hle-thru.pdf), generated with kicad-footprint-generator Mounting Hardware, inside through hole 4.5mm, height 7, Wuerth electronics 9775086960 (https://katalog.we-online.com/em/datasheet/9775086960.pdf), generated with kicad-footprint-generator Molex Mini-Fit Jr. Power Connectors, 105313-xx08, 8 Pins per row (http://www.molex.com/pdm_docs/sd/530480210_sd.pdf), generated with kicad-footprint-generator Soldered wire connection, for 4 times 1.5 mm² wires, reinforced insulation, conductor diameter 0.48mm, outer diameter 2.3mm, size source Multi-Contact FLEXI-E 2.5 (https://ec.staubli.com/AcroFiles/Catalogues/TM_Cab-Main-11014119_(en)_hi.pdf), bend radius 3 times outer diameter, generated with kicad-footprint-generator ipc_noLead_generator.py QFN, 76 Pin (https://www.marvell.com/documents/bqcwxsoiqfjkcjdjhkvc/#page=19), generated with kicad-footprint-generator Molex MicroClasp Wire-to-Board System, 55935-1330, 13 Pins per row (http://suddendocs.samtec.com/prints/hle-1xx-02-xxx-dv-xx-xx-xx-mkt.pdf, http://suddendocs.samtec.com/prints/hle-dv-footprint.pdf), generated with kicad-footprint-generator Mounting Hardware, inside through hole M3, height 5.6, Wuerth electronics 9774080243 (https://katalog.we-online.de/em/datasheet/9774080243.pdf.

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