True you can get a faster response with gearing however this is because you do not have to wait for the Windows system to send commands to the onboard processor, but instead the onboard processor does all of the work. The onboard processor is only able to gear off of another axis, encoder, or ADC. There is not a way to gear it to the ADC of a DAQ card.
Regards,
JR A.
Application Engineer
National Instruments