The default pitchbend in all Halion-based plugins isn’t smoothed enough, causing low but audible zipper noise, specially audible in high notes.
Demonstration:
pitchbend zipper.zip (1.36 MB)
In the first half, I set the pitchbend range to 0 and used the modulation matrix to modulate the pitch with pitchbend. I’m using the default “Smoothing”, so the zipper noise isn’t audible.
In the second half, I used the default pitchbend provided by Halion. The zipper noise is clearly audible, specially with headphones. You get the same noise if you use the modulation matrix and set the Smoothing to 0 ms.