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Combining them, I set up the system to load a new song by executing a sequence of commands whenever I moused the pointer into the upper right corner of the screen.ĭebouncing the pedal signals was more straightforward: I got the source code for qpdfview, modified it to accept only one page-change command every second, and recompiled. More searching led me to the Brightside and xdotool utilities, which offer a better way to eliminate the keyboard. This was no good, and the futility of this approach became clear as I launched into Gershwin’s jazzy “I Got Rhythm” and voicecommand, mistaking the music for speech, chirped along, “I do not understand.I do not understand.”

Just as often, it replied, “I do not understand.” “Hello,” it would acknowledge in a pleasant voice.Īfter pondering this for about 10 seconds, voicecommand complied by executing a command I had preprogrammed-sometimes. I hooked up a USB webcam for an audio input, and before long I was having conversations with the piano.
CALIBRE MOVIE GEEK CHODCOLATE SOFTWARE
To tackle the first issue, I dug through Linux software libraries and discovered voicecommand, a utility that hooks into Google’s speech recognition server to allow the Pi to interpret spoken commands and utter responses. I needed to filter out page-turn signals that arrived in quick succession. And sometimes when I tapped the foot pedal, it sent two forward or back commands rather than just one, a classic case of contact bounce.
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Each time I finished a song, I had to pick up a wireless keyboard to close the PDF and return to the Calibre score library. I paged back with another tap-it was working!īut two problems emerged. The next two pages appeared nearly instantaneously. A bar before the first page turn, I tapped on the foot control. I loaded the Duke Ellington song “It Don’t Mean a Thing (If It Ain’t Got That Swing)” and began playing. So I turned to another open-source program called qpdfview, a streamlined app that prerenders upcoming pages. I discovered that although Calibre is very good at organizing PDFs, it renders them too slowly when running on the Pi. Only an obsolete version of Calibre had been released for the Pi in a precompiled package, so I had to download the latest source code and compile it, a tricky process that took several hours. The Pi runs Linux, so I had reams of open-source software to draw on. I ran a small bundle of power and Ethernet cables to a power-line network adapter, along with an audio cable to a separate amplifier for playing MP3 backing tracks. Assembling the pieces was straightforward: The Pi, its case, a wireless mouse receiver, and a USB receiver for a pair of $80 wireless foot pedals all fit neatly onto the back of the display, held in place with Velcro strips. It occurred to me that a $35 Raspberry Pi might have just enough computing power and that I could tuck both the Pi and its cables out of sight behind the monitor, which I acquired for $170. What I need, I thought, is a thin, no-frills 24-inch monitor-and a cheap computer.

All-in-one computers are either too bulky to fit on the piano or exceeded my budget.
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Many people use tablets such as the iPad for this purpose, but none are big enough to display two typical 23-by-30-centimeter (9-by-12-inch) pages at full size. It was less obvious how best to display the scanned scores.

I then attached the Pi to the back of the monitor used to display scores. I connected a pair of foot pedals to a Raspberry Pi via a wireless dongle. Music Machine: After cutting musical scores from their bindings, I fed them into a document scanner whose page guides I had removed.
