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6.1.6.2. Phaser
Phase shifting has been popular since the 1970s. It takes advantage of the fact that a filter
will change the
phase of its input – moving where every wave cycle starts and ends – even
when no frequencies are being filtered out. An
all-pass filter doesn't change the frequency
content of the input, but moves its wave cycles a tiny bit in time.
If you split the input signal into two copies, then phase-shift one and leave the other alone,
their wave cycles will no longer align. If you then mix them back together, the offset in
phase will cause them to cancel each other out at various frequencies. This produces a tone
with frequency notches of varying sizes. Used this way, this effect is effectively a fancy EQ,
albeit one that can sound really cool sometimes.
But if you then use an LFO to modulate the phase shift, the notches move back and
forth, and the sound will change character drastically as they do. This produces the deep,
thick "whoosh" that phasers are known for. This sounds incredible on a string machine; for
example, putting a phaser on an Eminent 310 is how Jean-Michel Jarre created the famous
pad sound for his earliest albums.
The Phaser on Solina V is actually two separate phasers, each with its own controls:
Rate
: Controls the speed of the sweep. If the MIDI Sync button is pressed, the Rate amount is
expressed in fractions of the tempo (from Tempo/15 to Tempo/2) or note values (1/8 or 1/4).
Both kinds of settings are accessed with the same knob – turn to the left for tempo divisions,
to the right for notes.
Feedback
: Passes a bit of the output back into the input. When turned up, this produces a
distinctive resonant tone that works for some sounds but not for others.
♪
While you'll of course want to play with all of these parameters, take your time to fine-tune the
Feedback by Ctrl-clicking or right-clicking the knob. Small changes can make differences.
Depth
: Controls the strength of the phasing effect.
MIDI Sync
: Locks both phasers to the current tempo, synchronizing them with other
features like the LFO, Arpeggiator, etc.
Dual Mode
: Creates a mono effect where both phasers, each with its own settings, process
the signal together, creating a mono output. When it's turned off, one phaser outputs to the
left and the other to the right, in a stereo output that is wider in soundstage but less intense.
Arturia - User Manual Solina V - The Advanced Panel
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