Dear Chaleece,
although you may have found a way to "unspecify" your multiple regressors file already, I'd like to answer to the list. The recipe to "how to unspecify regressors" is:
1. Click on "Specify". This will bring up the file selector.
2. Unselect files (if any are selected).
3. Click "Done".
The batch system distinguishes between a "missing value" as after "Clear Value" and an "optional, possibly empty value". Therefore you get an "<-X" mark after "Clear Value", but not after selecting no files.
Best,
Volkmar
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