Indeed,
I have S&H since I bought it, don’t remember the TUN and I don’t know how it used to work, if it used to work as it supposed to be, change TUN to S&H is a terrible idea I prefer to have noise coloration and save filters for other purposes.
If I want a S&H on the noise I will use an LFO where I can set proper speed, etc.
I guess the noise is digital generated, and what the TUN or S&H does is to lower the noise modulation speed in this way high frequencies are attenuated and at the same time you can listen to some kind of S&H .
So this parameter doesn’t behave as the standard Noise Tune so you can’ call it TUN an that’s could be a reason they change it’s name silently to S&H.
As I said, is just a guessing.
EDIT:
@sicijk,
Does the Tun parameter used to behave different from the S&H?