Phasing, flanging, and chorus use much of the same technology as echo and delay units. All
of them are based on delay effects with a relatively small range of delay. We decided to enhance these delay-based effects with LFO modulation for the Delay effects to create special sounding effects.
Theory Of CHORUS
The chorus effect modulates the original sound using a low-frequency oscillator (LFO).
The LFO has RATE and DEPTH settings. The output produces a sound in which several sources play the same sound, but with some changes, which eventually sounds like chorus. When mixed together with the main audio signal, it creates an effect which sounds like multiple instruments are being played at the same time.
The Effect takes the audio signal and mixes it with one or more delayed copies of itself (LAYERS). Delays of the added voices is typically modulated by LFO.
While guitar pedal effects are usually mono, a stereo chorus applies the effect to left and right stereo inputs, or to a duplicated mono input, using two independent chains.
The two chains are modulated by one LFO and delay with detunes. Then the Left and Right channels go through TONE and ULTRA. Additional Micro-delays (ULTRA) create a wider and more intensive parallel delay line. After this, the sum of the signals from one channel and dry input is inverted and is sent to the second channel, where the sum of channels (MIX) can be adjusted.
Theory of FLANGER
A delay processor sends the input signal to the output at a later time which is set with the DELAY time. The delayed signal is combined with the original signal with the MIX parameter.
The number of delay repeats is determined by a FEEDBACK control (more feedback = more repeats).
The Flanger as a stereo-effect has a Phase Offset, which is an offset between the left and right modulation.
The Flanger effect originated by using 2 tape machines in sync mode. When the sound became unsynced, it created delays and sound engineers discovered a new time-modulation effect – the Flanger. Usually a flanger is referred to as a jet-plane effect.
Classic Phaser effects do not have a delay section, but two phasers with unsynced delays is a standard flanger effect.
You can modify the sound further, creating a comb-filter like effect, by manipulating the speed (RATE) in addition to the phase.
Theory of TREMOLO
Tremolo is a modulation effect that rhythmically changes the volume of your signal.
An LFO (low frequency oscillator) is used to create a waveform that turns the signal volume up and down (“plus” and “minus”). Using sine-waves produces a lush, strong tremolo. It is similar Vibrato effect which modulates pitch, while Tremolo modulates the amplitude. Tremolo is more useful for creating percussive shuddering or stuttering, as well as intense pulsating effects.
The Tremolo effect can also be used as a Panner-effect. A panner moves the sound left/right in the stereo field while a tremolo varies the volume. Tremolo can be used to get that classic “surf” sound especially when used with some spring reverb.
SPEED adjusts the frequency of the LFO and can be synced to the tempo of your song.
DEPTH sets the limit of volume/pan of the effect, varying from subtle to completely deadening of the signal.
SYMMETRY controls the shape of the LFO waveform. At 50% the waveform is perfectly symmetrical. At 0% the waveform shifts to the “PLUS” zone, while at 100% it shifts to the “MINUS” zone.
The PLUS knob controls the attack-length of the PLUS-zone, while the MINUS knob controls the attack-length of the MINUS-zone.
PHASE adjusts the initial phase modulation difference between the left and right LFO waveforms.
ANGLE adjusts the phase of the right channel relative to the left, to add stereo width and create an Auto-PAN effect.
WHY WE NAMED IT CRONUS?
CRONUS is a God of Time. Our CRONUS effect - is a Time/Amp Modulation Effect (3 fx in one box)
Six selectable FX-chain modes (selects Chorus/Flanger/Tremolo effects position in the chain)
Fix glitches in Chorus “Layers” parameter
Fix glitches in Flanger “Phase” parameter
v. 1.1.0: add Tremolo Sync. Tremolo have Speed (LFO rate) and measured in Hertz. Now we add Tremolo SYNC - synced Speed (LFO Rate) as quarter-notes for sequencer grid (1/64-4/1 wih D/T).