anchor.diff:  
      #:pattern
      #:pattern-p
  +   #:all-patterns
  +
  +   #:pattern-parent
  +   #:parent-pattern ; deprecated
  +   #:parent-pbind ; deprecated
  +   #:pattern-children
  +   #:pstream-count
  +   #:pattern-metadata
  +
      #:pstream-p
      #:as-pstream
      #:pattern-as-pstream
  +
      #:t-pstream
  -   #:all-patterns
  -   #:pattern-parent
  -   #:parent-pattern
  -   #:parent-pbind
  -   #:pattern-children
  -   #:pattern-metadata
   
      #:peek
      #:peek-n
  
positive.code:    #:scale-steps-per-octave
     #:scale-midinotes
  
     #:define-tuning
     #:all-tunings
     #:tuning
     #:tuning-name
     #:tuning-pitches
     #:tuning-steps-per-octave
     #:tuning-octave-ratio
  
     #:load-scala-scale
  
     #:define-chord
     #:all-chords
     #:chord
  
negative.code:    #:pstream
     #:pstream-elt
     #:pstream-elt-future
  
     #:*post-pattern-output-processors*
     #:instrument-mapping
  