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FlangerLope for iOS / macOS - Envelope Flanger
Howdy Folks,
And Appy New Year! I've released a new app today, and it's my first of 2026.
FlangerLope can function as a regular flanger and I think it can sound pretty decent in that regard. However, I wanted to have a go at a less common envelope-based flanger effect, where the modulation depth is err... modulated by the strength of the incoming audio signal. I think it's a really cool effect, especially on guitar. Frank Zappa used it a lot on his guitar solos!
If you're familiar with Zappa, or the hardware DynaFlanger (and various clones), you'll know what I'm talking about. I also wanted to simplify the envelope controls, so you've basically just got two parameters - the envelope sensitivity, and a damping / response time.
Another fairly unique feature (I think...) is the ability to combine traditional LFO modulation with the evelope follower. So you could add subtle LFO mod to the envelope or vice versa - great for creating less predictable and very dynamic flanging effects. (imho).
Here's a little demo in GarageBand with acoustic guitar:
As per with most of my fx, it's a universal iOS / macOS purchase for $1.99. Intel and Silicon Macs supported.
https://apps.apple.com/us/app/flangerlope/id6757301465
Available NOW!
Cheers, -Rob
Comments
Rob. That sounds great, love Zappa’s lead tones and playing.
Will give it a spin!
I hate flangers but love @Rob_Jackson_Music apps so it’s in the collection. I’ll see if I can make it do something that doesn’t cause me seasickness.
@FizzyLizzy27
Thanks!
The envelope mode, especially with the resonance and depth all the way down can be a very subtle effect. I often use it like that just to add a bit of movement (not nausea-inducing hopefully...) and also as a stereo-izer for mono sources using the spread control. The stereo image changes, depending on the strength of your signal. Increasing the smoothing time will also make the evelope response less twitchy.
Hope you can find a use for FlangerLope! Thanks for the continued support - really appreciate it. -Rob
Cheers @Tickletiger! If you add fuzz and wah (*) I think you can get into the Shut Up 'N' Play tone territory. I think for those tones, it's really about using it to create an interesting stereo effect.
At the extreme, using two FlangerLopes (one in envelope mode, the other normal) I was able to get pretty close to the Drowning Witch solo sound.
(*) have something in the pipeline that may also be of interest in that department...
For anyone wanting a bit more detail, given the App Store description really just gives an overview, here's an extract of the user guide:
Mode - Switch between Off (bypassed) or Digital and Analog modes. The Digital mode is very clean, but still warm. The Analog mode rolls off some top-end and adds a little drive to the internal processing for the wet / processed signal.
Rate - Sets the rate of the delay modulation LFO.
Depth - Sets the depth of the delay modulation LFO. To use FlangerLope in envelope mode only, set the Depth to 0%.
Regen - Sets the amount of delay feedback / regeneration. Higher values produce that classic flanger "whoosh" and really high values produce a slightly "metallic" ringing that flangers are well-known for.
Spread - Increases or decreases the stereo image of the flanger effect from wide stereo to mono. This works by putting the modulation for the left and right channels increasingly out of phase as you increase the control.
Envelope - Sets the sensitivity of the envelope follower, or set to 0% to disable it. A stronger signal will increase the depth of the modulation, then this will decrease as the signal decays, creating a "pillowy" modulation effect that literally envelopes your sound. The envelope follower response is also shown by the (F) indicator.
Tip: Interesting flange effects can be produced by using the envelope combined with a little bit of LFO modulation as they both work together.
Smoothing - Introduces a "damping" effect to the response of the envelope follower. At low settings, it's very "snappy", whereas higher / longer times slow down the response of the envelope follower. You can see that the (F) indicator will seem to "lag behind" as you play with a long Smoothing time.
The (F) Indicator
FlangerLope features an animated representation of the amount of delay modulation taking place. The further the (F) indicator moves to the right, the more modulation depth there is. The Rate of the LFO will also determine the speed the (F) indicator moves. When the Envelope setting is set to more than 0%, the (F) indicator also serves as a representation of the level of the incoming audio. When using the Envelope feature, if the (F) indicator is spending most of its time "slammed" over to the right, then the Envelope control is probably set too high.
Been playing Lo-Fi Tape through the two as you suggested, and it sounds great. Woozy.
Yes, have already tried 2 Flangerlopes in parallel in different modes, and rates.. lots of fun!
Rob. While we are on the subject of epic guitar tones, are you familiar with the John Mclaughlin track ‘Phenomenon Compulsion’? Has a really wild Flanger type effect, supposedly a ‘Marshall Frequency Shifter”
Any ideas how to recreate that with the Flangerlope?
Hi @Tickletiger - I wasn't familiar with the track, but had a quick listen. Aside from the stellar playing technique, I guess the fuzz / distortion is a big part of that sound. Sounds to me (maybe) that the modulation effect(s) is going into an already distorted amp - could be wrong though.
Haven't heard of that flanger and Google couldn't seem to find it either. I do recall Marshall did a little pedal called the Regenerator though, but I'm guessing that's not it.
Other than that, it does sound like a fairly standard flanger, so on FlangerLope, I'd go with vintage mode, not too much spread, and the resonance somewhere around half-way. Maybe just a bit of envelope applied to some LFO too for a bit of "movement".
@Tickletiger @Rob_Jackson_Music : I have found a number references to McLaughlin using a 360 Systems Frequency Shifter with a pedal to control the sweep in the 70’s
Here is a deep dive into the unit that I found
https://synthworld.blogspot.com/2015/05/the-incredible-mutation-and-restoration.html?m=1
A few articles say he was find of making use of the ring modulator output
Hey thanks Rob, really helpful. I’ll give it a go, (technique not withstanding!)
Espiegel123. Thats great, fascinating and very helpful stuff, Thanks!
Nice research there @espiegel123 - thanks!
So yeah... not really related to a flanger at all, but if McLaughlin was using the ring modulator output and sweeping it manually, I guess it would sound a bit "flangery" with high resonance.
Not that it's a clone of anything, but FlangerLope is sort of my take, and an extremely simplified one at that, on the MicMix DynaFlanger.
It’s pretty hard not to want an App called FlangerLope… Thank heavens it’s a fantastic app as well. Thank you @Rob_Jackson_Music.