iOS MARS is currently closed. Please read this for more information.

Reverb – Feedback Delay Network app review – Another great effects app from Amazing Noises

Reverb. As we all know, it is short for reverberation. It also means "to verb again" (OK, that last one is not true).

We all need a little reverb in our iOS music to simulate the natural occurrence of sounds reflecting off of surfaces in the real world. The new app Reverb - Feedback Delay Network (which I'll be referring to as Reverb FDN going forward) manages to not only simulate some real-world reverb, but allows you to create other-worldly reverb sounds as well.

Amazing Noises is a developer that has released several incredible effects apps recently, including GliderVerb and Limiter. Reverb FDN fits along nicely within this quiver of apps. But you say you've already got several reverb apps? So do I! But here's a few reasons why you'll want Reverb FDN.

First of all, as the name refers to, Reverb FDN uses Feedback Delay Network programming to create its reverb. What is Feedback Delay Network? Here's a page from a smart person at Stanford University explaining it, along with many Greek math symbols to more "clearly" explain it. As with many things in life, I don't pretend to understand the workings of it, but thankfully Maurizio Giri and Alessandro Petrolati (also of apeSoft) do understand all of this. After all, as the saying goes, I don't need to know how a combustion engine works to drive my car.

So, let's drive this car. As with most of the Amazing Noises and apeSoft apps, the interface will look very familiar. Contained almost exclusively to one main screen, you'll find all of your parameters dials within easy reach. Of note, as Reverb FDN is a Universal app, the iPhone version has a separate screen for all of the parameters. Briefly, you'll find the pre-Reverb low cut and high cut freq dials up top, along with the Dry/Wet, Pan, and output gain dials. The transport functions, as well as the Sampler Ratio slider right above the visualizer, as well as the file management folder. Again, it all looks very familiar.


Now, where Reverb FDN really comes into its own is the parameters down below. These will be available based on your selection of "Twisting Param(eter)s", which is the bread-and-butter of the app. If you choose to keep this in the "off" position, you can still adjust the simulated absorption of sound by the walls ("Walls Reflection"), the cutoff frequency of the internal low pass filter ("Damp Frequency"),  the associated "Damp Factor", the maximum and minimum distance of the sound "travelling" ("Max Distance" and "Min Distance"), and the "Network Shape", which is all about the previously mentioned FDN algorithm.

All well and good, and a fine sounding reverb app she be. But, this is an Amazing Noises app, and you came here for the crazy. So go ahead and turn on the Twisting Parameters. Here is where you can randomize the LFO frequency and the LFO amplitude. You'll find immediately that your input source is altered. Also available is the "Echo Separation" and "Morph Inertia" parameters, which affect the amount of separation between echoes (in percentage, works with the Max and Min distance parameters), and the smoothness of the transition between the previous effects.

Two additional on/off button options are for the Reactive Walls and the Echoes. Interestingly, the Reactive Walls effect will trigger a vibration along with the Reflection parameter, changing the sound by adding some noise into each reflection. The Echoes switch works in conjunction with the previously mentioned Echo Separation, and is also represented as a percentage.

As you can guess from all of the preceding overview, there are many, many ways to alter your original sound source. After running through some of the presets, I further discovered the joy of using an LFO to control the parameters, something I didn't do enough of in my previous review for Sparkle. Finding out that you can set the Sampler Ratio (essentially the tapehead direction) to a sine wave, and adjust the frequency and min/max parameters gave me the option to automate the track to move slowly from forward to reverse. The same can be done to the pan, to create a great swirly effect. In fact, every parameter dial can be set to either LFO, X/Y accelerometer, or MIDI CC.


I had a lot of fun playing around with Reverb FDN, and was able to get some out of this world sounds from a simple sound source. There have been some other great examples that I have seen in the iOS community as well, but one of my favorites was a recent video by Jakob Haq on his "Haq Attaq" YouTube channel. On the video linked here, he shows how using the microphone input can yield some incredible results. Check it out, and while you're there, I highly suggest subscribing to his channel. He's one of the best iOS musicians and video bloggers around.

Technical details time: Reverb FDN is a Universal app, and is both Audiobus and Inter-App Audio (IAA) compatible. It's not a big app at all, coming in at just 11.5 mb, so surely you've got the room for it on your device. I used it on my iPad Air, and didn't experience any issues whatsoever (I'm on the dreaded iOS 8.1.2, so that's good news). You can record directly into the app, or use Dropbox, AudioCopy, or "Open In" to bring in your samples. If you've used other Amazing Noises and/or apeSoft apps, this is familiar territory.

Amazing Noises has created three outstanding apps lately, in GliderVerb, Limiter, and now Reverb FDN. These apps both lean very much towards experimental and avant garde sounds. Those aren't the exclusive uses for these apps, but they certainly do not shy away from chaos. If you're someone who is into ambient, drones, noise, or experimental sounds, you really must pick this app up today.

If you are thinking about buying Reverb - Feedback Delay Network, please consider clicking through our App Store link below. Thanks!

[app 950600083]

Post Navigation