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Interesting. Thank you for the post.

The console had no USB at the time of this incident but during the most recent period of use it did have one. I removed it at the end of that session to purge/copy files.

It’s also possible to gack a Roland M-400 with a usb drive although doesn’t result in a complete freeze of control function.

I think I’ll spare myself the “fun” of a formal case file etc. on what seems to be a very isolated situation that will prolly be healed by a firmware upgrade and continue to crowd source info.

Thanks again.