Yamaha SY85 Owner's Manual page 139

"BPF" Type
The "BPF" (Band Pass Filter) setting produces a filter response that allows
only a band of frequencies centered at the cutoff frequency (See "Cutoff"
above) to pass. The "Band" parameter (below) determines the width of the pass
band.
The illustrations here are not available.
"BEF" Type
The "BEF" (Band Elimination Filter) setting produces a filter response that
eliminates a band of frequencies centered at the cutoff frequency (See "Cutoff"
above) to pass. The "Band" parameter (below) determines the width of the
elimination band.
The illustrations here are not available.
Band (BPF & BEF bandwidth)
Range: 0 ... 127
Controls: [CS6], [-1] [+1], Dial
Determeines the width of the frequency pass or elimination band for the
BPF and BEF filter types, respectively. The minimum setting of "0" produces
an extremely narrow pass or elimination band, while the maximum setting of
"127" produces a wide band.
3:Filter
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