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Hi, This does not belong directly to the MIOS, but I haven't found a better sub-forum for my question... I'm trying to learn a lot of the low level stuff associated with MIDI right now. Mostly about USB connection. The svn repo is pretty good for it. I learned a lot of it already... I'm thinking about implementing myself(for learning purposes) a MIDI-USB connection with my STM32f4 dev board. I'm planning to use an ULPI PHY for HiSpeed Connction to achieve lowest latencies(8 times lower latency than FS). I think the Interrupt transfer method should be the best fit for it, since it has guaranteed latency. But now I saw in the svn repo that the MIDI-USB endpoint descriptor uses only bulk as transfer method. Is this just for the compability issue or is it a wrong idea to use the interrupt transfer method, to achieve lowest latencies? Ah just for record, I'm a pretty fussy drummer regarding latencies, since I hear/feel a small difference between 5ms and 10ms(measured and compared by ear...). Best Regards Philipp