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5-step sequencer, expanded to 8 notes means ~$16-20 in parts, needing 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 EPCOS app note 93 (https://www.catagle.com/45-2/PDF_AN93.htm Bourns TBU-CA Fuse, 2 Pin (https://www.bourns.com/data/global/pdfs/TBU-CA.pdf), generated with kicad-footprint-generator Hirose DF13C SMD, CL535-0414-1-51, 14 Pins (https://www.molex.com/pdm_docs/sd/026604020_sd.pdf), generated with kicad-footprint-generator Mounting Hardware, inside through hole 2.7mm, height 8, Wuerth electronics 9776040960 (https://katalog.we-online.com/em/datasheet/9776040960.pdf), generated with kicad-footprint-generator Molex 0.50mm Pitch Easy-On Type FFC/FPC Connector, For LVDS, 2.33mm Height, Right Angle, Surface Mount, ZIF, 24 Circuits (http://www.molex.com/pdm_docs/sd/5022441530_sd.pdf molex FFC/FPC connector Pitch 0.5mm http://chip.tomsk.ru/chip/chipdoc.nsf/Package/D8A64DD165C2AAD9472579400024FC41!OpenDocument VSON 10 Thermal on 11 3x3mm Pitch 0.5mm SON, 8-Leads, Body 5x6x1mm, Pitch 1.27mm; (see Texas Instruments DSBGA BGA YZP.

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