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16-pin IDC connector when nothing is plugged into it. Manual one-step-forward via momentary push button. Play continuously or play once (switch to select mode, then use manual reset button to advance the step manually. This requires hardware de-bouncing to avoid multiple triggers on each Could replace step IDs with a 7-segment display with LED backlight TFT graphical display 480x272 16-bit colour with LED backlight 128x64 RS-232 I2C or SPI http://www.lcd-module.com/fileadmin/eng/pdf/grafik/edip128-6e.pdf LCD-graphical display with LED backlight 160x104 RS-232 I2C or SPI TFT-graphic.

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