Hi Kevin,
We confirmed your findings and this is a bug. We have reported this to the engineers and we hope to have this resolved in a future software release. I cannot confirm when, but hopefully in the near future.
Actually to clarify this a bit further, we have just the Digitech FS300 not the FS3X, so the issue is not inherent to the aux switch but within the software itself.
Thank you for reporting this! 
