Re: [LAU] USB MIDI controller - update

On Sun, 29 Jan 2017, termtech wrote: In the mackie case and bcf2k in mackie/LC mode, faders are sent as pitch. So the MSB and LSB are included in one event and both are sent every time. In NRPN case... things are different. The receiver should respond to any one of the four events based on the last received values for the the other three. It is quite common though in the case of receiving the MSB to check the following event to see if LSB has changed as well. The four events should always be sent in order. Events can be left off starting at the first event, but once one of the events is sent, all following events are sent.... sort of. The last event is optional (at least some manufactures treat it so - like Allen & Heath) so a receiver has to check if the last event is there or not using a short timeout (time to transmit one byte or event depending on the parser). Best practice for transmitting is considered to be sending all four events every time. This accounts (mostly) for such things as merged MIDI signals. In theory, a MIDI merger should consider the four nrpn events as one event and should create a new four part event even if only one is received and then send the whole event without interleaving. However, I suspect most just interleave by the standard midi event (1, 2 or 3 bytes). -- Len Ovens www.ovenwerks.net