RetroPa's Pianola Roll Player - Arduino controlled, optical scanning

Using modern technology to play back vintage player piano paper rolls - great fun!
A bit of history - Overview and demonstration of the player - Some of the features in more detail. Bonus trailer - schematics and Arduino code (unpublished, but feel free to freeze frames and screengrab to take a peek).
Links:
• Rex Lawson plays Strav... Rex Lawson playing Stravinsky on a push-up pianola and Steinway grand.
• Player Piano Roll Disi... Damaged roll destructing itself while playing.
github.com/nai... Software using camera scanning and pattern recognition
• Chopin Sonata No.3 Op.... RUclips demo of PlaySK
00:00 Hundred year old music rolls
00:34 A bit of history
01:04 Rex Lawson playing Stravinsky
01:31 Music roll repertoire range
02:00 Gabriël Fauré performing
02:29 Modern scanning methods
02:42 PlaySK Piano Reader demo
03:18 Overview & demo of my roll player
04:44 Tracking adjustment
06:07 Under the hood
06:42 Tracker bar / scanner construction
07:26 Recognising/decoding perforations
08:00 Paper roll ripping
08:07 Sustain pedal function
08:47 Tempo correction function
08:58 Expression functions
09:19 Themodist 'snakebites'
10:11 End-of-Roll autostop function
10:23 Rewind and Start-of-Roll autostop
10:49 Conclusion and thank you
11:05 Bonus Trailer: music, schematics, code.