(a2ps.info)It Prints in Simplex

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10.1.2 Why Does it Print in Simplex?
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     Though I ask a2ps to print Duplex via '--sides', the job is printed
     Simplex.

   If your printer is too old, then a2ps will not be able to send it the
code it needs when '-s2' is specified.  This is because your printer
uses an old and not standardized interface for special features.

   So you need to
  1. specify that you want Duplex mode: '-s2',

  2. remove by hand the standardized call to the Duplex feature:
     '-SDuplex',

  3. add the non standard call to Duplex.  Try
     '--statusdict=setduplexmode:true'.

   Since this is painful to hit, a User Option (Note: Your Shortcuts)
should help.