Flanger BL-20 - General Questions
Do you have questions about the Flanger BL-20?
You will likely find some answers here.
1. Left panel buttons:On/Off is a bypass button.
Mono/Stereo is a 2-position switch. When in Stereo, we have full stereo processing. When in Mono, the source signal is "monoized" (Left and Right inputs are summed before processing).
Zero Cr activates the "Zero Crossing Mode". It inverts the polarity of the modulated signal and delays the dry signal of the mean delay curve, so that we have this specific zero crossing effect. The resulting effect is an increase in the undulating characteristic of the sound.
2. Mix - DopplerDry/Wet mix control knob.
Default is 50%, but range goes from 0% (dry signal only) to 100% (wet signal only).
3. RegenSets the amount of affected signal fed back into the effect, accentuating characteristic comb filter effect.
This effect occurs because the modulated signal is combined with dry signal, causing a change in the phase relations.
4. Graphical Vu-meterThis is a row of "LED lights" that will show the combined "movement" of the effect, according to the way the different controls affect on the modulation.
5. Control Mode3 switches: Manual, Env (Envelope Follower), and Auto.
All of them can be combined and the resulting modulation will be the sum if each modulation source.
6. ManualAllows you to control the delay time manually. It can also be controlled by a function set in the Function Generator.
In this case, the function applies a modulation on delay time, which is summed with the Manual knob’s value.
7. ENVAudio envelope follower. As such, it reacts to audio level, and that way changes flanger intensity.
Threshold sets the detection threshold of the envelope follower.
Decay controls the amount of time the envelope takes to reach zero after being deactivated.
8. Ext env/Int envAllows you to choose between two modulation sources.
Internal envelope means that the input signal is chosen as a modulation source.
External envelope allows you to have an external signal as a modulation source. Each DAW has its own way of configuring this.
9. AUTOLet the flanger be controlled by the LFO.
Rate controls the speed, while Depth controls the amplitude, and therefore the amount of induced modulation. Rate can also be synced to musical values, which can be handy if we want the Flanger to act in sync with the music.
10 . Reverse Sweep O/P 2The pedal can be used as an alternate source of modulation.
This button reverses the sweep on the right channel.
This will have an impact in the stereo image of the processed sound, as well as in the resulting effect.
If you have any further questions, feel free to contact us.