just to make sure you got the setting right first..
have you define the finisher?
look at control panel , IR6000 printer properties > device setting >output options
select your matching finisher.
then when you want to print, klik finishing > print style booklet printing, also select saddle stitch.
dont forget to choose all pages on page range you want to print.
If your setting is already right, probably you need to reinstall the driver. Try using PCL5e driver. you can get it from canon usa website.
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