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Attenuator Scroll Step
When you scroll the main dB controls or those at the top of the dB Slider dialog, the values normally change in the smallest steps allowed by the resolution of your sound card. The resolution is typically about 1 dB, but may be 3 or even 6 dB or more in some portions of the range.
However, if you activate Use Level Daqarta can provide resolution better than 0.01 dB over the entire range. In this case, the scroll steps are set by this Scroll Step control in the Attenuator Options dialog.
The default is to move in 1.0 dB steps, but you can set a larger or smaller step size here.
A typical use for this option is where you want to change the loudness of a stimulus in steps of a fixed size. For example, you may want to use 10 dB steps to screen subjects for hearing loss.
Regardless of the Scroll Step setting, you still have 0.01 dB resolution whenever Use Level is active. So if you manually enter an attenuation of, say, -1.23 dB and Scroll Step is set to 10.00, then scrolling down will give -11.23, -21.23, etc.
Note that the Scroll Step value has no bearing on the operation of the large dB slider controls, which always move in 1.0 dB steps when Use Level is active.
AtnScrStep=5 sets the Attenuator Scroll Step size to 5.0 dB.
Alternatively, AtnScrStep=>1 increases the step size by 1.0 dB, and AtnScrStep=>-1 decreases it by 1.0 dB. Only +/-1.0 dB steps are allowed in this format.
Note that this command is enabled only when both Use dB and Use Level are active. Otherwise, the macro may abort with an error message. To be safe, give UseCal=dB followed by UseLevel=1 before AtnScrStep.
See also Generator Attenuator Options Dialog.
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