Igor,

The MIDI Specification says:

"A receiver must be capable of recognizing either method of turning off a note, and should treat them identically."

Does that help you?

Regards,

Forum Admin (MMA)

Has that always been true? I'm writing for some late-80s synths (Roland U-110 and D-110).

Running status has always been a required feature of MIDI, and many keyboards have been using it since the beginning.

In practice, almost everybody gets this right. The only two known exceptions are the first class-compliant version of the M-Audio MidiSport Uno (they quickly fixed it; you should not see one in the wild nowadays), and the the QinHeng/WinChipHead CH345 USB/MIDI chip, which is still being sold with this error (and other errors, like corrupted SysEx messages).

Thanks all, helpful. The software I'm working on receives and sends MIDI messages. So to make sure I have it 100% clear, if I listen out for note-offs, convert them internally to zero-velocity note-ons, and only ever send zero-velocity note-ons outwards, I should be OK, because there's basically no software or hardware in the wild that expects note-offs and will be left hanging. Do I have that right?

Thanks again!

My software is used as a controller and I've always sent note off messages. It's worked so far with all the DAW software and devices I've test with.

IIRC, the velocity byte in a Note Off message was intended to be available for use in adding expression to the ending of a note, .e.g. perhaps modulating the release time, or filter release curve. Synths not implementing this ignore the velocity byte and just terminate the note the same way as a Note On with zero velocity. However I never came across anything that actually implemented Note Off Velocity (not that my experience is particularly encyplopedic).

NoteOff - vel = 0 or vel = 64?

What about the case where the synth responds to the velocity in the NoteOff message? I have been requested to "fix" the velocity sent in a NoteOff message, that our sequencer sends, from vel=0 to vel=64. It turns out that this is the way the "spec" suggests sending a NoteOff.

Anyone have any thoughts on this topic? I guess the NoteOff vel enables more expressive playing.

Thanks,
Steve

Steve,

It seems to be dependant upon whether a keyboard is capable of generating and transmitting note velocity.

The detailed MIDI 1.0 specification says the following (I hope it's okay to quote the spec?):

MIDI 1.0 Detailed Specification 4.2 11, spanning pages 10 and 11.

"The three methods of using Note-On (9nH) or Note-Off (8nH) are as follows:

3. Where the keyboard implements both Key On Velocity and Release Velocity, a note is turned
on using 9n 0kkkkkkk, 0vvvvvvv, and turned off using 8n, 0kkkkkkk, 0vvvvvvv."

Any help?
JohnG.