Thanks Terry,
Just want to note that none of the other voices on my DB exhibit similar behaviour. All of them fade completely static/crackle free. The issue exists only on kick 2 level in a very specific range and occurs regardless of the pitch/decay settings. It is not a overdrive/clipping circuit type effect, which I can achieve on the other voices with the (in)correct settings. If you'd like me to resend the example file I posted so they can actually listen to it, please provide an email I can send to.
As for other analogue gear having this issue. I've used a wide range of hardware over the last 20 years, repaired gear for the last 10, and the only time I've encountered a similar sound is with dirty or worn potentiometers. A bit of deoxit/lube usually clears it right up, but I'm hesitant to do anything like that as I've had this less than a week.
If this is/was common to this voice on all devices, I'd think the EEs at Arturia would have used a simple RC network as a passive low pass filter to eliminate the offensive high frequency "harmonic content", especially on a sine sub/kick.
The harmonic content explanation is rather condescending as kick 2 is the one voice that ought not have any additional harmonic content no matter the pitch given its output shows up as a pure sine on my scope.
This is more of a little annoyance than a huge issue, but denying it exists doesn't do anyone any good here. Is there someone from Arturia tech that could address this directly?
EDIT:: Had a chance to play with the DB for a few hours tonight. Played a lot with the Kick 2 Level and the scratching seems to be fading away with use. It is now confined to btwn 3-4 o'clock (rather than 2-5) positions and much quieter than it was initially, barely happens turning clockwise, fainter but still noticeable anti-clockwise. Fingers crossed that the trend continues and this sorts itself out!