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Is it an SDHC or SDXC card?
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It needs to be formatted as MS-DOS (FAT32) and they come that way out of the wrapper.
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Make sure to unplug the pedal (power off) before inserting SD card and then power it on after the card has been inserted.
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Try using an earlier version of the firmware; does the pedal display UPDATING and go thru the process?
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Here’s a link to additional tips, techniques and procedures: Help. Problems exporting project to SD card
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If still having issues, reach out to Support, support@singularsound.com for help.
Let us know how it turns out.