Retrokits - Full USB MIDI hosting the @korgofficial #electribe sampler, #nanopad and #nanokontrol2 together. With the #rk005 as standalone usb host these extra 'nanosliders and nanobuttons' are a welcome addition to the
High-Speed USB MIDI Host Box - DOREMiDi
USB-HUB - Retrokits
Inexpensive SMALL usb HOST — Audiobus Forum
RK-005 USB MIDI Hub - Retrokits
Retrokits RK-005 USB MIDI Host | Reverb
RK-005 Firmware Version 1.4 Adds New Features and OP-1 Menu Support : r/synthesizers