Simple Zoom up/down patch switcher.   I wanted a simple way of going up and down through patches on an MS-60B - this would also allow one effect in each patch to be switchable.   This uses the Arduino Pro Mini (3.3V version) and a USB host shield, which keeps it all in a compact format. It does require a minor modification to the host shield as the Zoom pedal will take power from the USB connection, which needs to be at 5V. This is the USB host shield I used: https://www.ebay
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