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The Push function that connects the identified pin to the zynth and operates a function in the GUI via the short, bold and long press's.
The Push function that connects the identified pin to the zynth and operates a function in the GUI via the short, bold and long press's.
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Because there are only 12 pins needed for the Encoders and the MCP23017 has 16 pins, there are four pins un-allocated.
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These 4 spare pins were set aside for 4 momentary push buttons, which could be allocated to almost any function with the configuration sections.
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These are the S1 to S4 buttons that appeared with the V4 version for zynthian.
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[[File:Zynthian-v3.jpg|500px|thumb|center|Zynthian-v3]]
===MCP23017 pins===
===MCP23017 pins===