===== Pattern Play Mode =====

==== Initialization ====

(fill in here)

==== Pattern Play Loop ====

The pattern play loop looks like this:

  - Read any input from the switches
  - If the function has changed, stop and exit
  - If we are in master sync mode, handle tap tempo
  - Start a new chain if the chain key was just pressed
  - Finalize chain mode once chain is released
  - Display Somthing...
    - If we are in the middle of chain mode, then display the current chain and add patterns/tracks **OR**
    -If up/down is pressed handle pitch shift **OR**
    -Display the current data
  - Or Handle Playback
    - If the pitch shift keys are released, stop blinking the leds
    - If they changed the pattern/track build a chain one pattern long to the new pattern/track
    - Display the current (and next if applicable) track
  - If we are playing and have midi or din sync handle the sync through clock ticks and play the note with [[do_tempo]]
  - if we get a Midi Song Select message, set it to the current pattern/track
  - if we get a stop message (midi, dyn, r/s) then stop
  - if we get a go message then start playing
  - toggle slide if slide button pressed
  - toggle accent if accent button pressed
  - toggle rest if rest button pressed

<note classic> CodeRefactoring:  This function seems rather smelly (large method, lots of complex conditionals).  From a maintainability and readability standpoint it would be nice to do the "Replace conditional with function" and "Decompose Function" on this monster function to turn it into a bunch of small pieces. </note>