179 APPENDIX B - GLOSSARY
Filter which passes a range (band) of frequencies while rejecting
others outside this range.
Bandstop filter (BS)
Also called notch filter or band reject filter. Practically the oppo-
site of a bandpass filter i.e. rejects a range of frequencies while
passing others outside this range.
Beating
Rhythmic effect usually caused by two oscillators almost (but
not quite) in tune with each other. Noticeable beating also
occurs between sine oscillators that are nearly an octave, fifth
or fourth apart.
Bipolar
Possible values can be negative as well as positive. This term
can apply to Amounts as well as modulation sources (e.g. LFOs,
Pitch Bender, Key Follow).
Bus
A common (i.e. available to several sources at once) audio sig-
nal path used for routing purposes.
C
Carrier
Term borrowed from FM radio (the dial adjusts carrier fre-
quency) meaning the oscillator being frequency-modulated by
another. Also used for the audible signal from a vocoder, which
“carries” the formants of another signal e.g. your voice. See also
modulator.
Category
Classification of programs e.g. Bass, Lead, Drums etc..
CC (two-digit number)
MIDI continuous controller number. MIDI standard index of
physical controls. Several of these numbers have been speci-
fied e.g. Modulation wheel = CC 01, volume control = CC 07,
hold/sustain pedal = CC 64 etc.. The list of sources in the Virus
modulation matrix includes several of these.
Channel Pressure
Monophonic Aftertouch (often simply called Aftertouch). MIDI
data caused by pressing harder on the keyboard after playing
notes. See Key Pressure.
Clock
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