Slo - Fast Hrn Speed Controls the Low Frequency Oscillator (LFO) speed of the Horn. Ranges from 0.06 to 16.0 Hz.
Slo - Fast Hrn Depth Controls the intensity of the rotating effect. Ranges from 0 to 30 milliseconds.
Slo - Fast Hrn Doppler Sets the amount of shifted pitch heard in the Horn. Ranges from 0 to 50 milliseconds.
Slo - Fast Rtr Speed Controls the Low Frequency Oscillator (LFO) speed of the Rotor. Ranges from 0.06 to 16.0 Hz.
Slo - Fast Rtr Depth Controls the intensity of the rotating effect. Ranges from 0 to 30 milliseconds.
X-Over Selects the frequency where the signal is split between the Horn and Rotor. Ranges from 25Hz to 20kHz.
Acceleration: H - R Sets the amount of time that the Rotor and Horn take to come up to their full rotating speed. Ranges from 0 to 10
seconds.
Tremolo and Auto-Panner
Look out, because the popular Tremolo and Auto panner effects of the 50’s and 60’s are back with a vengeance. These effects that revolution-
ized “Surf-Style” music can be heard all over the air waves in the 90’s. Tremolos and auto panners are similar to one another in that they both
use an LFO to modulate input levels to produce vibrato effects.
Tremolo
The word tremolo actually has several definitions in the music world. It basically means that a sound is being modulated in amplitude (the
volume is beating or pulsing). It could be emulated by turning a volume knob up and down. But you probably have better things to do than
turn a volume control up and down throughout a whole song, so let the RP-20 Valve do it for you.
Aside from speed and depth parameters, the tremolo also has an LFO waveform that determines the way a signal's volume is increased and
decreased. While the Sine wave is probably the most common to the ear, the Triangle and Special 2 waveforms are progressively more intense.
When do I use Tremolo? Tremolo is truly a vintage sound for the guitar, electric piano and organ. Most pronounced on the guitar, you
can hear it used on everything from sweet ballads to blues rock 'n roll.
Auto Panner
The auto panner is really just a dual version of a tremolo. It changes the amplitude of the left signal just as a tremolo does, but the amplitude
of the right signal is inverse to that of the left signal. This gives the illusion that the signal is moving back and forth between the left and right
speakers.
The Auto Panner's Speed typically doesn't get set as fast as the Tremolo since you usually want a sound to move smoothly back and forth in
the stereo image. The Millennium auto panner is especially flexible since it can be used for either mono or stereo input sources. When used
with a mono source, the signal pans back and forth as described earlier. When a stereo sound source is used, the original stereo image is
maintained by moving the volume of the left signal exactly opposite of the right signal. The stereo image fades back and forth between the
RP-20 Valve
User Guide
Section - 4 Editing Modules
41
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