Pineapple Zero extends MIDI cabling to more than 10m. The very first prototype (photo) just repeated MIDI signal from MIDI IN to MIDI OUT. The current version (Rev. 1.2) uses RS-422 driver and it can extend MIDI signal to about 1,000m in an ideal condition.
Current: Rev. 1.2.0 Release branch (preparing the official release)
Stable: Rev. 1.0.0-RELEASE. (Internal MIDI connector is deprecate by Rev. 1.2.0.)