# FD-1 Filter Delay — user reviews

> 9 indexed App Store user reviews of FD by Kai Aras, rated 4.60/5 from 32 ratings.

- Source: https://appshunter.io/ios/app/fd-1-filter-delay/id1448696965/reviews
- App overview in markdown: https://appshunter.io/ios/app/fd-1-filter-delay/id1448696965.md
- Rating breakdown: 5★ 28 · 4★ 1 · 3★ 0 · 2★ 1 · 1★ 2

## Most critical reviews (9 lowest-rated)

### 1/5 — abandonware :(

*2024-05-28*

many unanswered emails later i am pretty sure this app is not being maintained. if it doesnt work in aum or loopy pro it doesnt work dudes.

### 1/5 — Very Buggy

*2020-04-22*

This app is infested with bugs.  Virtually unplayable.  The knobs either don’t turn at all, or they swing wildly to and fro like they have a mind of their own. I’ve tried unloading and reloading, no change.  I am using this in AUM.  This is so incredibly frustrating, to spend money on an app that clearly is having major performance issues.  Hello, developer??? Please fix your app, or give it away free!

### 2/5 — Unusable in Nanostudio

*2021-10-03*

Not because it doesn’t work, but the interface isn’t scaled correctly, so the knobs overlap each other making them very hard to tweak. Don’t know if this is the case for every daw, I only tried Nanostudio.

### 4/5 — please update with the same love as for ShockWave.

*2020-02-01*

Absolutely fanatical app. And now please update with the same love as for ShockWave. Thank you very much.

### 5/5 — Love this effect

*2025-08-27*

Great app. 5 out of 5, with one exception. When loading in AUM it won’t. The icon goes red, everytime, even when reloaded. Maybe just me?

### 5/5 — Fantastic

*2024-12-10, version 1.1.2*

I’ve had this for years and has been rock solid. One of my go to effects.

### 5/5 — Big knob issue

*2020-06-02, version 1.1*

Unnecessarily big knobs in the middle dwarf the sequencer and even crowd out the section headings at the top of the interface making it look like a badly cropped screenshot.  
Effete concerns aside, it sounds fantastic, hence the 5 stars (and I will probably be equally generous if I ever get around to reviewing the other apps of his I own).  Wide range of sound shaping capabilities that can either utterly dominate and warp your sound or just complement it by dancing like a drowsy winged herd of fireflies in a yonder glade.   Well that’s how I use it anyway...

### 5/5 — Blue Beauty

*2019-11-14, version 1.0.1*

Alike all of Kai's apps, this is a real beauty both inside and out. I love it especially on drums and other percussive sounds... gives them an instant change in character. Super easy to create and save your own presets, so I've been at it ✊🏽 Gonna be a go-to 😎

### 5/5 — An excellent effect for sound designers and groove manipulators

*2019-11-08*

Really well thought out plug-in from Numerical.  It took me a minute to realize all that I could achieve with this effect once you wrap your head around it it’s super powerful.  I still don’t fully understand the sequencer portion but I’m having fun figuring it out.  Some of the knobs are a little sticky in auv3 but that’s a simple bug fix.  Well done on another dynamic effect, Kai.

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-12.*