Yamaha SY85 Owner's Manual page 173

Reso (Resonance)
Range: 0 ... 99
Controls: [CS7], [-1] [+1], Dial
Determines the degree of filter resonance.
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. If a filter type other than "LPF" is selected,
no resonance can be produced and "---" appears on the display in place of the
parameter.
The illustrations here are not available.
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.
Vel (Velocity sensitivity)
Range: -63 ... +63
Controls: [CS8], [-1] [+1], Dial
Determines how the filter cutoff frequency changes in response to velocity
changes (e.g. keyboard dynamics).
Plus "+" settings produce higher cutoff frequencies in response to higher
velocity values — i.e. the harder a key is played, the higher the cutoff fre-
quency. The maximum setting of "+63" produces the maximum level variation
in response to velocity changes. Minus "-" settings produce the opposite effect:
lower cutoff in response to higher velocity. A setting of "+0" results in no
cutoff variation.
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