Arturia Flanger BL-20 User Manual page 13

• Now that we tried all the three control modes, it's time to get a little wilder.
Flanging BL-20 has some unusual controls that can perform quite interesting
roles. Mono, when pressed, sums the Right and Left input signals (both Dry and
Wet paths) so the whole plug-in will work on a Mono source. There's little else to
say about it. But we have two other buttons deserve mention. One is right after
Mono, and is labeled "Zero Cr". The other is in the extreme right of the Main panel,
and is labeled "Reverse Sweep O/P 2". This last button has an effect even if Mono
is pressed. For now, let's put the Flanger BL-20 in Auto mode (activate the AUTO
button and deactivate the ENV button), and play it again;
• While it plays, press the Zero CR button. The red LED above it will lit. You will
notice that the stereo image expands. Usually, the delayed (flanging) signal is
summed to the dry signal, creating the expected peaks and valleys that are the
result of comb filtering. This button inverts the polarity of the Wet and delays
the Dry signal, this way creating phase cancellations, hence more comb filtering.
This increases the depth of the flanging effect;
• Now, it's time to try the Reverse Sweep button. Press the Zero Cr button to turn
it Off, and press the Reverse Sweep button to turn it On. The bright green LED
above it will lit. Now put the Rate in unsync mode (the little black button has to
be off), and turn the knob all way to the left. Turn the Depth knob all way to
the right. When you hit play, you will notice the signal slowly "floating" from one
channel to the other. This reverse sweep causes stereo widening, and will be
more noticeable with a sustained sound, like a synth pad;
• And that's pretty much it in what concerns the controls present in the Main panel.
As we showed, this effects unit has more than you could imagine at first sight.
But we're not done yet. Please read below;
Arturia - User Manual Flanger BL-20 - FLANGER BL-20 OVERVIEW 9