"all notes off" button

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Hello you all. I'm a user and I have a portuguese blog about OSSoftwares. I have a wish from you that will help many people, I think LMMS is needing a "all notes off" button because sometimes the midi breaks and we can't stop the sounds and that button would be very useful.
Thanks!
I agree, but perhaps i can give you a litle trick. Most often it is zynAddSubFX or vst instruments that 'hangs'. You can silent the instrument by giving it focus. So if you kind of know what instrument that it is, try clicking on the instrument in the song-editor and it will stop. -btw, Earlier (<=0.4.4) lmms versions did have a button that did silent all instruments. The 'quality-button' worked that way. It was removed, and perhaps for some good reason .. 8|
-But try the trick with the focus, it should work.'
BR