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ACCESS VIRUS OS4

Notes on Adaptive Parameter Smoothing

If you wanted to take this an 
extreme, you could record the 
movements of every knob and but-
ton to a separate track. Although 
this sounds like a classic case of 
overkill, it can facilitate the process 
of editing the recorded sequences: 
Bear in mind that the sequencer 
doesn’t indicate the parameters 
addressed via the control features 
of the Virus by their names; 
instead, it indicates merely the 
controller and/or polypressure 
numbers. If you split up these con-
trol features by recording them to 
different tracks and giving these 
tracks names that give you an idea 
of what they contain, you’ll find it 
much easier to work with these 
tracks.

We developed a feature called 
Adaptive Parameter Smoothing for 
the Virus that assures automated 
knob movements are carried out 
so that parameter changes are not 
audible in steps commonly called 
zipper noise.

This means that the Virus responds 
just as smoothly to your sound-
shaping actions as did the analog 
synthesizers of yore that were 
used before the devices that could 
store sounds were introduced. To 
this end, the response of the Virus 
is manipulated so that it smoothes 
changes in parameter value. Con-
veniently, this feature is dynamic, 
meaning that it takes into account 
the way these values change. 
However, smoothing is many cases 
undesirable. For example, left to its 
own devices, this feature would 
smooth deliberate, more radical 
knob movements where one value 
”jumps” to the next, thus creating 
unintentional ”glitches”. For exam-
ple, this type of response would