FYI: Thorsten just released a new Midibox Seq firmware that supports USB MIDI host on the STM32f4 based Midibox core. It currently doesn't support USB hubs, but it supports class compliant USB midi controllers plugged directly into the core... Might be worth taking a look at his code to see if this could work on the LXR...
Having a pad controller directly plugged into the LXR would be great.
http://midibox.org/forums/topic/18906-usb-host-support-for-mbhp-core-stm32f4/
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