Yamaha TG500 Owner's Manual page 113

Res (Resonance)
Range: 0 ... 99
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.
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
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.
VOICE EDIT MODE / 1: Quick Edit
1-3: FILTER 101