Updated to support Arduino 1.6.4 and Teensyduino 1.23.

New Features

• Audio Patterns! Uses an MSGEQ7 chip to provide music visualization.
• New and improved patterns!
• New clock faces!
• Update files via USB MSD (mass storage device) mode, without removing the SD card!
• Support for Teensy RTC, in addition to DS1307. Requires 32 kHz crystal, this one from Adafruit will work but is a little large.

Improvements

• Support for simple, single messages file, with one message per line, using default font, color, location, speed, and scroll mode.
• Random playback mode no longer changes to a random palette each time it switches patterns.
• New Random palette changes to a randomly chosen palette from the list (Rainbow, Ice, Fire, etc) each time the current pattern is changed (manually or automatically).
• Improved remote control interaction (better handling of held buttons, buttons only enabled where they make sense, etc).
• Improved menu interaction (modes and settings only enabled if optional hardware available, etc).
• A single press of the PlayMode or Palette button now shows the current selection. Another press while the indicator is shown moves to the next. Left and Right buttons move backwards and forwards, respectively, as long as the indicator is shown. The Select button hides the indicator.
• Patterns and Audio Patterns modes now use a shuffled list for random playback mode, allowing forward and backward navigation.
• Improved text clock (use "five past two" instead of "two oh five").
• Autoplay duration settings menu item now has a seconds label, number wraps from 999 to 1 and back.
• Held overlay button now shows and hides overlay.
• Brightness Up/Down buttons now exit power save (off) mode, in addition to Power and Cycle Brightness buttons.
• Brightness no longer 'wraps' when changed via brightness up/down buttons.
• Animations will now finish playing (no matter how long they are) before autoplay and random playback modes move to the next animation.

Bug Fixes

• Fixed overlay button not always cycling through clocks and messages correctly.
• Fixed clock not always being available.