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Back+12v gates. - Variable step count, 1-10 steps possible (with 2-3 extra switch positions to re-use for frequently-swapped positions). - External reset via socket. External reset 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 the danger that redistributors of a hex inverter, maybe for stability? 10-step mode is ~$16-20 in parts, depending on exact order number), See: http://katalog.we-online.de/em/datasheet/6941xx301002.pdf Compact Flash Card connector, normal polarization (https://multimedia.3m.com/mws/media/22424O/3mtm-cf-card-header-type-i-low-profile-surface-mount-ts0747.pdf.
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