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Any data coming in through the digital inputs of the acquisition board/evaluation board will be saved as events in the all_channels.events file (when using Open Ephys data format) or the KWIK file (when using Kwik format). There will be one event when a channel goes "high," and another when it goes "low." This will happen automatically, there is no configuration necessary. It's not currently possible to disable event saving for particular channels; anything that comes in on the 8 digital inputs will be saved.
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