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#337273 02/19/16 11:09 AM
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I have heard about this problem but it has never happened to me before.

What causes stuck notes? I assume it is a midi problem. So far I haven't seen it with an RT only song. I am using an SD50 hard synth for midi and a Focusrite 2i2 interface as a sound card.
I previous thread said to unfreeze the offending song and regenerate. This seems to work but the problem is happening on several songs and is intermittent so it's hard to tell.
Is there anything I can do permanently?

Thanks
Tony

Tony Wright #337277 02/19/16 11:45 AM
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I know of one possible cause: MIDI polyphony. Each hardware synth like your Roland SD-50 has a maximum limit of the notes it can handle and sound at one time. That limit may be 64, or maybe 128; not sure about the SD-50. You might think that BIAB could not generate that many messages to overwhelm a hardware synth, but it can because some patches require up to six messages per sound. Multiply this by many notes in a chord, and many tracks of MIDI instruments including a drum kit, and it's easy to hit the limit. MIDI "on" messages must be followed by MIDI "off", but sometimes those are not received. It's why music programs using MIDI all have a "Panic Button" to turn off MIDI.

To test this, mute some tracks and see if the problem goes away.

Other possibilities include system memory (reboot) and corrupted BIAB files.

EDIT: Just checked and your SD-50 has 128. That's good, but sometimes not enough.

Last edited by Matt Finley; 02/19/16 11:49 AM.

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Tony Wright #337289 02/19/16 12:38 PM
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Don't know if it helps, but there is a checkbox in MIDI options to "Send Extra Note-Offs". This might help with stuck notes. It's unchecked by default, but worth a try to check it and see if it solves the problem.


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Tony Wright #337290 02/19/16 01:06 PM
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Yes, good suggestion, John.


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jford #337303 02/19/16 03:09 PM
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Originally Posted By: jford
Don't know if it helps, but there is a checkbox in MIDI options to "Send Extra Note-Offs". This might help with stuck notes. It's unchecked by default, but worth a try to check it and see if it solves the problem.


As you say, worth a try but it is supposed to be designed to enhance a STOP command.

In the meantime I have programmed a foot switch to send F12 - MIDI Panic, much better than trying to hit a small F12 key.

Tony

Tony Wright #337606 02/22/16 03:09 AM
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Stuck notes:

All midi notes have 2 very important signals in them.... the ON signal, telling the synth when it's supposed to start the note, and of course the OFF signal telling it... yup, you guessed it.... when to stop playing that note. Of course there are many more signals in the data for the note... velocity, pitch, volume, etc.... but we're not worried about those in this conversation.

A note gets stuck on for a few possible reasons.

1. Something happened to make the synth miss the off signal...

2. The computer decides to glitch, or the driver or the synth itself, and essentially lock up due to a driver issue or something else in the OS.... since many synths load to memory, a corruption of that load will do it too.

Most DAW's and programs that work with MIDI will have some sort of EMERGENCY KILL SWITCH on the dashboard that will immediately send the off signal to the synth. You should always learn where that button is located.

If you work with audio, there's a very small chance you will ever get a stuck note.... although I have seen audio loops when something corrupts the OS and the computer is about to crash. My old laptop is prone to OS crashes and the audio loop freeze before the BSOD happens to it occasionally.

Most likely, though, stuck notes happen when working with MIDI synths. I used to do a lot of MIDI stuff in my early days and this stuck note thing is fairly common in that realm. In many cases, I could hit the KILL SWITCH, and everything would be fine. It simply reset the synth.

Last edited by Guitarhacker; 02/22/16 03:14 AM.

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