Yamaha MU90R Owner's Manual page 59

MULTI MODE
LPF Cutoff Frequency (LPF Cutoff)
This determines the cutoff frequency of the low pass filter (LPF). The
LPF filters out frequencies higher than the cutoff point and "passes" the
lower frequencies. Lower cutoff values create a deeper, more rounded
tone, while higher values create a brighter tone.
These frequencies are
"passed" or let through.
LPF Resonance (LPF Reso)
This determines the amount of filter resonance or emphasis of the LPF
Cutoff Frequency above. Higher values make the filter effect more pro-
nounced and stronger, creating a resonant peak around the cutoff fre-
quency.
5 0
Graphically shows LPF Cutoff Frequency setting for each Part.
Selected Part and MIDI channel
Level
Graphically shows LPF Resonance setting for each Part.
Selected Part and MIDI channel
These frequencies are "cut"
or filtered out.
Frequency
LPF Cutoff Frequency setting