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One-step-forward 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 7-segment display with LED and photoresistor 3 Lead Plastic Package OnSemi CASE 100CY, light-direction upwards, see https://www.everlight.com/file/ProductFile/ITR1201SR10AR-TR.pdf reflective opto couple photo coupler IR Receiver Vishay TSOP-xxxx, CAST package, see https://www.vishay.com/docs/82493/tsop311.pdf package for Siemens SFH900 reflex photo interrupter/coupler/object detector, see https://www.batronix.com/pdf/sfh900.pdf Siemens SFH900 reflex photo interrupter coupler object detector Fiberoptic Reciver, RX, Toshiba, Toslink.

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