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The design was simplified in order to reduce the number of analog crosspoint switches, hence the projected retail price. I've also decided to adopt the Arduino shield standard for the breakbout boards, while using a dedicated Arduino Uno for every polyphonic channel. Without the iPod Touch and with switches for only two channels, the 8-channel module might retail for less than $1,000, which would be pretty cool... Last but not least, I've added a mockup of the backplane on the module's page.