item: There are pitfalls in using equal division within which
          to calculate 2-interval-patterns which the unwary traveler
          will most certainly fall into.
                                                                                  - Erv Wilson [0]

• Set engine selection list with engines that are installed
• Wait until engine is loaded before trying to load next engine
• Do not offer mx.samples engine when there are no audio/mx.samples
• For midi_out.pitch_bend_value() reuse, pass pitchbend semitones as 2nd argument

• Fix to work when midigrid lib is not installed

• Add MIDI in keyboard support on virtual port 1
• Add MIDI out monophonic pitch bend note play on virtual port 2
• Add "MollyThePoly", "MxSamples" engine support
• Autosave params on change
• Load from saved params on init
• Add new ratios display - show intervals/chords as played

• Add "browse scale by name" input in norns screen UI
• Update named scales list from Scala
• Add initial pitch-bent MIDI out support (disabled for now)
• Display interval ratios on display.lua view

• Add "circle" display - show intervals on circle spokes.
• Add "strings" display - show line lengths proportionate to interval ratios.
• K3 toggles original, circle, and strings display.
• Add M medium step to scale sequences.
• Add more just intervals and chords.
• Label scale in display with an exisiting scale name when it exists in MusicUtil, the Xenharmonic Wiki[1], or Scala[2].

• Define scale as a sequence of Ls steps.
• Configure large L and small s step sizes, and scale notes length.
• Configure pitch using base note, Hz tuning, octave, and scale mode and tonic note.
• See scale intervals rendered next to sequence, e.g. M3, P5, etc.
• Arpeggiate notes in scale.
• Play scale notes using Grid as a isomorphic keyboard.

[0] An Introduction to the Moments of Symmetry [1] Xenharmonic Wiki [2] Scala