Versions:

   1.74  add host/preset sub-directories and associated files
         calls to loadPresets() nthPreset() replace direct references to presets 
         add xtrlCmd() xtrlReq()
         allow compilation under __XTRLCTRL__ runtime model
         break Echotron::clear() out from ParmMenu::evHandler()
         Echotron::clear() clears all slots ifdef __XTRLCTRL__
         Echotron::clearSlot() also sets note.hold to false
         noteOn() does not automatically clear echo.hold ifdef __XTRLCTRL__
         no need to explicitly clear flags.RSTMUTE
         syncs with lib 1.17
   1.73  use embedded U/I frames 
         syncs with library 1.16
   1.72  bugfix: upper bound condition in LED iteration corrected to "< NUMLEDs" from "<= NumLEDs"
         [31722] _STNDLONE_ lib 1.15 Build 1.6.6
   1.71  newOsc() returns NULL (instead of new Osc())
   1.70  nix BUILD_166 conditional compilation sections
   1.69  add FRAME21 pots to control lead 1 detune and transpose
         [31742] _STNDLONE_ BUILD_166
   1.68  edit presets/macros to use byte values <= 128 when setting LFO depths 
         syncs with library 1.13
         [31684] _STNDLONE_ BUILD_166
   1.67  === FIRST PUBLISHED VERSION ===
