LinPlug relectro - Manual (Page 16)

The main processing section finally contains a EQ section, but its really
only EQ-alike. Like with most EQ’s you have frequency and gain controls,
to set up a operation frequency and the gain volume change. The relectro
EQ is a simple Low/High shelves EQ. Unlike the EQ you have in your daw
or as a separate plugin, this EQ has infinite slope. And as its like all main
parts of relectro working on a per-wave-cycle basis its results are different.
While usually an EQ does affect all harmonics, the relectro EQ does treat
the complete wave cycle, disregarding its harmonic spectrum.
What does that mean ? Lets look at an example: Assume some audio at
440 Hz, but with lots of harmonics, lets say a saw wave. With a
conventional high-shelf EQ at 2 kHz, you would be able to reduce all
harmonics at 2 kHz and above. The relectro EQ however, set at 2 kHz wont
touch the audio at all, because it looks at the full wave-cycle, which has a
440 Hz frequency and is thus below its operation frequency.
This makes much of a difference, audibly. The relectro EQ in some way is
less effective as it ignores harmonics, but more effective as it has infinite
slope and it adds some distortion as its emphasizes or reduces individual
single wave-cycles in the audio stream.
1
1 The distortion when volume changing single wave cycles comes from sudden
change in harmonic spectrum as well as added harmonics at the transition from
one cycle to the next. No need to know these technical details though.
LinPlug relectro user manual Page 16