GLIDE v3.1 — the arpeggiator

The arpeggiator. fn+a breaks the backing into notes. Tap a chord on the
jam row and it runs root-3rd-5th-octave in time, hands-free; tap four and the
run walks your progression. fn+a cycles up, down, up/down and off; fn+z
steps the note rate (1/8, 1/8T, 1/16, 1/4); fn+x widens it to two octaves.
The speed is the jam tempo, so tap tempo on \ moves it. It is a texture on
the progression rather than a new mode: no key changes meaning, the strip over
the scope reads ARP^ while it is armed, and it is off again on every restart.
The walk is clocked on the audio engine, and the first chord takes a one-beat
count-in so a quick run of taps lands on the grid.

Jam octave. Settings → Jam octave puts the backing register anywhere from
two octaves under the grid to two over. The default is now one octave over: an
octave under was a fine bass pad on headphones and mud on the built-in speaker.
Above C7 the backing folds down instead of whistling, and the setting auditions
live while a jam runs. Drones and the progression follow it alike.

LISTEN's second guesses. While the result card is up, space cycles the
runner-up readings (the sibling mode, the safe pentatonic, the relative twin),
each applied live with a fresh six seconds to judge it. ` or enter
keeps what is showing.

Smaller things.

• The help screen, the manual, the keymap and the printed playing guide carry
  the arpeggiator; the settings row for the older per-beat drone walk now reads
  arp (1 drone/beat) so there is only one thing called "arp".
• A one-shot tip mentions fn+a the first time you solo over a spelled
  progression without having found it; it retires the moment you use the key.
• The splash reads v3.1.

Saved sounds, settings and the SD library carry across as always. Install the
same way as any update: copy GLIDE.bin to /apps/, delete the installed
GLIDE in Launcher, install the new one.