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Re:Converting a Guitar Effects Pedal to Output MIDI by SeanLuke on Saturday August 26, 2017 @10:40AM (#15105634)
USB isn't optoisolated. This is its killer flaw as a replacement MIDI transport.
Re:Converting a Guitar Effects Pedal to Output MIDI by photojosh on Saturday August 26, 2017 @10:04PM (#15108682)
It can be, see https://www.adafruit.com/product/2107

Surprised the high-end gear doesn't built it in!