Hello! It is only a few days ago, suddenly a problem occured. When using a midi controller (breath controller), there was - after a certain time - a humming in the track of the used softsynth. It sounds like a long sustained sound of the synth which does not stop. Sometimes, the humming occurs not only in the used track, also other tracks are "activated to hum". It is like a humming orchestra, nerve-racking (if I do not "mute" the tracks concerned). Sometimes, some humming stops, if I give midi-inputs in the softsynth-tracks concerned. I deleted some synths (for exemple Reaktor) and started them anew (without success). With the breath-midi-signals, everything is okay. I tried the midi-ox-midi-monitor. One other thing: If I change a softsynth-track and give midi-input, you sometimes (not always) hear several softsynths very loud (only at the first midi-signal). In the case that happens, several softsynth-tracks are humming furthermore. Really weird. If I use the audio-output of a keyboard (for exemple), there is no problem. It is a problem with the midi tracks (or the EWI-midi-function), I guess. Do you know, if it is a problem of the softsynths (Kontakt, Absynth, Reaktor, Swam Engine Mr. Sax, ...) or a problem of Sonar X1 (64bit, Win7)? I think, I did not change anything important in my Sonar-system within month (and it worked without problem). I should add, that the softsynth (which hums) does (often) not respond properly to the midi-signals of the EWI any more. Some of the notes are hanging, some are lost, some are played wrong.