MeeBlip cubit duo: USB MIDI interface and MIDI thru | meeblip
DigitalLife MIDI-EXT100 1-Port MIDI-USB Extender Over CAT5/6 Compatibl
Getting Started with MIDI Keyboards | Sweetwater
Dan Becker's - Use USB to Power a MIDI Device
Electric keyboard MIDI keyboard 61 keys SD-10 electronic keyboard 300 timbre & rhythm portable keyboard with MIDI function easy to use, Two power supply modes - Walmart.com
How do I split power supply output for two or more pedals?