It isn't at all like I thought. It's like a ressonance problem, more like "diiiiiiing" than "hiiisssh".
But what's really strange is, indeed, that manual tweaking doesn't cause it, while pattern tweaking does.
I suspect that it is changing some settings and doesn't fully change them until the audio is rendered.
A twk comes always before a note (i.e. tweak, note, render audio) if it is on the pattern.
When tweaking manually, most often may happen twk, render audio, note, render audio.
At least this is my first suspicion
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<[JAZ]> Pa pi pa pa pa pi pa.... ;·D
