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Feedback Duration Keyword

<FeedbackDuration N>
<fbd N>

    Parameter and switch to set the feedback duration to N ticks.  Normal feedback timing is to generate the feedback display once a response has been received, schedule it to be displayed in two ticks, generate a blank display to erase it and schedule that to be displayed 32 ticks after the feedback.  The scheduling of feedback does not affect the use of <delay> so if you set a short display interval you could have feedback frames interspersed with the frames of the next item (feedback was never intended to be used in rigorous timing scenarios).

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