HP Mode notes
After you have become familiar with the general "feel" and sound of
"Classic Mode" try pressing the "HPF" pushbutton while listening to the
signal.
On full range material you will notice that the character of compression
"relaxes" slightly, letting more detail and low frequency content through.
This is because low frequency content is contributing less to the control
signal that tells the VCA how much to compress the entire audio signal.
NL Mode notes
"N/L" stands for the non-linear capacitor circuit, which provides the P3S ME
with a very fast attack and release for short transient sounds, and a longer
attack and release for slower waveforms. This function is similar to effects
that can be had on the Valley 610 dynamics processor.
You will notice that this effect is rhythmically dependent and works on some
material very well and not as effectively on other material. But when it
comes together, you can almost erase the drum track leaving only ambient
room sound at the output.
