Yamaha AN200 사용자 설명서

Chapter 6  Filter (VCF)

Technically, the FEG Depth controls how the Filter works over time.  This is even shown on the panel for you:

With the the [CUTOFF] and [RESONANCE] knobs set respectively to 9:00 and 
3:00 (see above), slowly turn the [FEG DEPTH] knob.

Depending on the Pattern selected, negative settings (setting the knob left of 
12:00) may result in little or no sound.  But once you turn the knob past the 
halfway point (12:00), you’ll start to hear the filter “opening up.”  Turn the knob 
slowly for gradual filter sweep effects.  Also try working the knob in time with 
the rhythm for dynamic “wah” effects.

Indicates a “dip” in the filter, 
just at the start of each note.

Indicates a filter “peak,” just at 
the start of the note.

Determines the degree or depth of the filter 
effect over time.  Positive values result in a 
normal EG; negative values use a “reverse” 
EG — producing a filter sweep effect that 
dips and comes back up, rather than one that 
peaks and goes down.

Range
-128 — 127