Arduino for STM32

I'm facing the same problem.
I'm using the USBComposite_stm32f1 USBMIDI capabilities, but it doesn't handle sysex (either in or out).
Which library did you use ?

Hi First post here, so hi everybody! I have designed a MIDI controller that works fine with a Teensy (ARM based). I decided to go beyond the prototype stage, and go into production (that'll probably go through a Kickstarter). I thought a SMT32 would be more convenient and more future proof for that....