Yamaha SY85 Owner's Manual page 45

Although the SY85 includes a sophisticated digital filter system that can be
precisely controlled via the full-edit parameters, the simplified filter parameters
provided here have been specifically created for fast, efficient filter program-
ming.
[CS3] selects either the filter defined by the current filter parameter set-
tings, or one of 15 preset filter types for the current voice. The filter types are:
Quick Edit Filter Types
0: -------- Full-edit filter.
1: VeloSoft Velocity sensitive, soft response.
2: VeloWide Velocity sensitive, wide response.
3: VeloHard Velocity sensitive, hard response.
4: VeloReso Velocity sensitive, resonant.
5: SynBass1 Synthesizer bass 1.
6: SynBass2 Synthesizer bass 2.
7: SynBras1 Synthesizer brass 1.
8: SynBras2 Synthesizer brass 2.
9: Sweep Sweep-frequency filter.
10: SlowAtak Slow-attack filter.
11: LPF_Init Initialized LPF.
12: HPF_Init Initialized HPF.
13: BPF_Init Initialized BPF.
14: BEF_Init Initialized BEF.
15: Thru No filter.
[CS6] sets the cutoff frequency of the selected filter (0 ... 127). Lower
cutoff values produce a lower cutoff frequency and higher values produce a
higher cutoff frequency. If the "Thru" filter type is selected, no cutoff fre-
quency can be set and "---" appears on the display in place of the parameter.
[CS7] determines the degree of filter resonance (00 ... 99). This parameter
has a similar effect to the "resonance" settings on traditional analog synthesizer
filters — i.e. it determines the height of a peak in the filter response at the
cutoff frequency. Higher resonance values produce a higher resonant peak and
reduce the overall bandwidth of the filter, passing a narrow band of frequencies
at the filter's cutoff. If a filter type other than "LPF" is selected, no resonance
can be produced and "--" appears on the display in place of the parameter.
4. Voice Editing & Effects
43