User Manual

38 User Manual v 1.0.0
UNFILTER
AVG & DCY Additional parameters that affect the way LEARN evaluates your signal give you additional
control over how this process works. Most importantly, the parameters AVG and DCY, which
control how quickly LEARN responds to changes in the signal, and how quickly it "forgets" what
it has seen.
AVG takes the average over time to detect components in the signal that contribute notably to
the overall sound of the signal. Low values for AVG will make the estimated filter response
adapt quickly to the signal. However, it will also make the process react to spurious changes
that are not actually part of the original signal, such as a click resulting from a cable being
unplugged during a live recording, or transients generated by muting the signal abruptly in
your DAW. Higher values will make the process slower to adapt but you will also increase the
chance that important parts of the signal, especially attack transients will be missed (and
omitted from the filtered response).
Likewise, DCY determines how quickly LEARN forgets what it has seen in the signal. Lower
values are generally very useful if your recording has overall properties that are changing
slowly over time, such as a moving sound source (or mic). A setting > 0.99 for DCY will disable
the forgetting process entirely, and everything will be remembered by the algorithm. In this
case, you need to press the RESET button in order to reset the algorithms' internal state when
working with a different signal. For moving sound sources and filtering effects DCY should be
set to a value < 0.99, for removal of stationary filtering effects such as channel EQ you should
try the highest possible setting. For channel auto-equalization in order to create a good sound
for longer recordings, such as mixes and audio streams, try a value around 0.5 for both AVG
and DCY.