Hi, > The USB MIDI protocol has three sysex bytes per packet, so > it seems the first packet gets dropped for some reason. ah, interesting info. > If you're using a UHCI(?) controller I find ohci_hcd 23560 0 ehci_hcd 34692 0 ohci1394 35716 0 ieee1394 312376 2 eth1394,ohci1394 uhci_hcd 35216 0 To be honest, I do not know if I really need both uhci and ohci; I guess not? > and this happens the > first time you're receiving data after having unloaded the > driver before, this may be a bug in the kernel. ?A > workaround would be to reload the USB drivers(s), too. I'll do some tests the next days. Maybe I'll wait because I just ordered a new USB-MIDI-Patchbay and I'd like to do the tests with it, so I can ensure it does not depend on my current Edirol UM-1S. Best regards ce