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How do I ramp a digital output frequency

I am using Labview 6i with a PCI-6601 board.

I need to apply a linear ramp to an output frequency on a digital TTL
output; in order to accelerate the speed of a stepper motor. Is there a
method by which this ramp can appear continuous, seamless?

Currently, with each update in output frequency, there is a pause (some 5ms)
where the digital output -counter is being re-initialised with the updated
value.

Thanks
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