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Non-inverting op-amp. A CV in to pause the sequence. Probably can't do, or impractical: - CV-controlled CV offset module - add a voltage to trigger steps. Replace C10 with 100K resistor, and bridge out R44 with a diameter between 16-19 mm: https://www.keyelco.com/product.cfm/product_id/826 Keystone #500, 12mm CR1220 battery holder, http://www.keyelco.com/product-pdf.cfm?p=710 AA CR2 A battery holder Keystone type 106 battery holder Keystone 2xAAA cell battery holder, http://www.keyelco.com/product-pdf.cfm?p=710 Battery holder for CR1216/1220/1225, https://linxtechnologies.com/wp/wp-content/uploads/bat-hld-012-smt.pdf battery holder Keystone type 105 battery holder with leaf spring, Keystone, https://ken.keyeuro.eu/cat/590.pdf AA battery cell holder CR2032 retainer clip, SMT ( http://www.farnell.com/datasheets/1505853.pdf BC-2001 CR2032 2032 Battery Holder BH-331P Battery Type 3xAA battery CR1225 coin cell vertical Cherry MX keyswitch 1.75u plate Cherry MX keyswitch ISO enter plate Matias/ALPS keyswitch, 2.25u, http://matias.ca/switches/ Matias ALPS keyswitch 2.00u vertical plate Cherry MX keyswitch, 2.00u, PCB mount, additional ground contacts, https://www.neutrik.com/en/product/nc3mbv-e B Series, 3 pole XLR female receptacle with 6.35mm (1/4in) mono jack without switching contact, vertical PCB mount, (http://www.qingpu-electronics.com/en/products/WQP-PJ398SM-362.html WQP-PJ398SM WQP-PJ301M-12 TRS 3.5mm mono vertical jack thonkiconn qingpu 3.5mm horizontal headphones jack, http://akizukidenshi.com/download/ds/switronic/ST-005-G.pdf Connector Audio Switronic ST-005-G 3.5mm Horizontal Waterproof Stereo Headphones Jack, https://www.technik.com.hk/images/pdf_product/WP3002-PA66-A.pdf audio jack stereo horizontal circular TRS 3.5mm, horizontal, through-hole, https://downloads.lumberg.com/datenblaetter/en/1503_07.pdf TRS audio jack stereo horizontal waterproof 6.35mm (1/4 in) Vertical Jack, Non-switching mono jack without switching contact, vertical PCB mount, https://www.neutrik.com/en/product/nc3fbhl1 B Series, 3 pole male XLR receptacle, grounding: without ground/shell contact, horizontal PCB mount, black chrome shell, https://www.neutrik.com/en/product/nc5mbh-b B Series, 3 pole female XLR receptacle, grounding: ground contact to mating connector shell to pin1 and front panel, horizontal PCB mount, http://cherryamericas.com/wp-content/uploads/2014/12/mx_cat.pdf Cherry MX keyswitch 2.00u plate Cherry MX keyswitch, 2.75u, http://matias.ca/switches/ Matias ALPS keyswitch 2.00u PCB Cherry MX keyswitch 1.75u Matias/ALPS keyswitch, 2.25u, plate mount, http://cherryamericas.com/wp-content/uploads/2014/12/mx_cat.pdf Cherry MX.

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