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Screen Zero Individual Null buttons
The four Null buttons in a column below the Individual Screen Zero button are labeled LI (Left In), RI (Right In), LO (Left Out) and RO (Right Out). Clicking one of these buttons forces the value of the associated edit control for that channel trace to 0. This will typically center a bipolar trace vertically on the screen.
LI.ZeroScrnNull= (value ignored) nulls the LI (Left In) control. Use RI., LO., or RO. prefixes for the other channels.
Note that these Null buttons are disabled unless the Individual button is active (depressed), and the display is in waveform mode (neither Spectrum, Spectrogram, nor Pitch Track active). If you attempt to use a ZeroScrnNull command when the button is disabled, the macro will abort with a "Control disabled. Aborting macro." message.
You can check if this control is enabled via an E.IF.ZeroScrnNull= control enable IF test. You don't need to specify which Null button via LI. or other prefixes, since all are enabled or disabled together.
See also Zero (Screen and Data)
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