Oscillators - Access VIRUS CLASSIC User Manual

Three filter envelope knobs are used to control the envelope follower when it is active:
ATTACK
KNOB: FILTER ATTACK It controls the attack rate of the envelope follower. With this parameter,
you can determine how fast the envelope follower will respond to the rise in signal level. Higher val-
ues slow the envelope follower down and delay its response.
ENVELOPE FOLLOWER RELEASE:
KNOB: FILTER DECAY It controls the decay time of the envelope follower. With this parameter,
you can determine how swiftly the envelope follower will respond to a decrease in signal level.
Higher values let the Follower linger.
ENVELOPE FOLLOWER GAIN:
KNOB: FILTER SUSTAIN It controls the input level of the envelope follower directly. The nominal
value is the center position (64).

Oscillators

PULSE WIDTH MODULATION
Pulse width modulation is a very effective method for producing beat oscillations without having to
resort to several detuned oscillators.
Dial OSC BALANCE to the far left so that only OSC1 is audible, then select the waveform Pulse for
this oscillator (OSC1 Shape to the right). Slowly turn the Pulse Width (PW) knob back and forth. As
you change its pulse width, you'll hear movement in the sound itself. When its pulse width remains
fixed, the sound will remain static. This to-and-fro pulse width modulation can be automated by
means of an LFO. Select PWM for LFO1 Amount and set a relatively high modulation amount. You
can vary the intensity of the modulation via LFO Rate.
VIRUS CLASSIC MANUAL 161
Tips And Tricks