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Socket. External reset via socket. - External reset via momentary push button. Play continuously or play once (switch to select segments from each step. Could 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, CR1220 battery holder, Memory Protection Devices P/N BC12AAPC, http://www.memoryprotectiondevices.com/datasheets/BC12AAPC-datasheet.pdf BC2003 CR2032 2032 Battery Holder 2479 Battery Type 3xAA battery CR1225 coin cell battery holder, http://www.comf.com.tw/ProductDetail.asp?no=148 Keystone type 106 battery holder for CR1216/1220/1225, https://linxtechnologies.com/wp/wp-content/uploads/bat-hld-012-smt.pdf battery holder for CR1216/1220/1225, https://linxtechnologies.com/wp/wp-content/uploads/bat-hld-012-smt.pdf battery holder with leaf spring, Keystone, https://ken.keyeuro.eu/cat/590.pdf AA battery cell holder 2xAA cell battery holder, Memory Protection Devices P/N BC12AAPC, http://www.memoryprotectiondevices.com/datasheets/BC12AAPC-datasheet.pdf BC2003 CR2032 2032 Battery Holder BA9VPC 9V 2xAA cell battery holder, Memory Protection Devices P/N BA9VPC, http://www.memoryprotectiondevices.com/datasheets/BA9VPC-datasheet.pdf PP3 Battery Holder.

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