# SlowMoFX — Slow Motion Audio Effects

> AUv3 audio plugin for creating half-speed and other tempo-synced audio effects. (iPhone/iPad app by Limelight Software.)

- Source: https://appshunter.io/ios/app/slowmofx/id1536139632 (this page in markdown: same URL + `.md`)
- Developer: [Limelight Software](https://appshunter.io/developer/370131860)
- Category: Music, Photo & Video, Music
- Price: $9.99
- Rating: 3.69/5 from 13 App Store ratings · 10 written reviews indexed
- Age rating: 4+
- Requires: iOS 13 · 12 MB
- Languages: English
- Released: 2020-10-22
- Data updated: 2026-07-07
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/slowmofx/id1536139632/reviews.md

## What is SlowMoFX?

SlowMoFX is an AUv3 plugin that allows you to seemlessly mix incoming audio with a slowed down version in perfect sync with the current tempo. This allows you to obtain that sort after half speed effect that is used by many famous DJ's around the world.

You can dropout the original audio completely to create dark downtempo atmospheric versions of a song and slowly and seemlessly return to the original mix. This is great for drums and percussive rythms. Lead instruments with sharp attacks when slowed down give those distinctive trap melodies and booming basses.

Simply press the POWER button to turn on the effect. It will smoothly transition to a mix of the original and a slow halftime version. Selecting the 4x option will slow down to quad time making the mood even darker, while the 1.5x can be used to generate triplets and syncopated beats.

The low and high pass filters can be used to determine how much of the input is effected, while the mix knob controls the depth of the effect.

The Glide button enables a smooth glide from the none effected pitch to the destination pitch for those slow down and speed up type effects. A ping pong mode also allows you to alternate between forwards and reverse play while the reverse mode creates long soothing syncapated textures.

SlowMoFX also sports a number of built in effects that can be enabled in order to create smooth transitions such as delay and reverb, while the EQ, drive, phaser, pan and pitch effects allow you to add flavour to the sound. If running under a DAW such as AUM that allows multiple output busses you can route the effected signal through your favourite external effects.

Features:

• Paramter and MIDI automation of main controls.
• Filtering of input using LP / HP filters.
• Built in EQ, Phaser, Pan, Delay, Reverb, Drive and Pitch effects.
• Fade In/Out controls.
• Ping Pong and Reverse modes.
• Supports buffer sizes from 1-16 beats
• 2x, 4x and 1.5x slow down supported.
• External Effects loop in supported apps.
• Includes comprehensive Help.

## Key features

- Half-speed audio effect
- Adjustable slowdown speeds (1.5x, 2x, 4x)
- Low and high pass filters
- Built-in delay and reverb
- Ping Pong and Reverse modes
- MIDI automation support

## Chart rankings

- #186 in Top Paid · Music (US App Store)

## Recent user reviews (10 of 10)

All indexed reviews: https://appshunter.io/ios/app/slowmofx/id1536139632/reviews.md

### 1/5 — It don‘t work

*2021-05-05, version 1.03*

I use Garageband. And every time i play from the begining the effect turn off. I think it work like Cableguys Halftime or Grossbeat from Fl Studio.

### 3/5 — Needs static “on” “start”

*2021-03-14*

I think me and a lot of others expected this to behave like Cable Guys Halftime. It’d be awesome if you could have a button to lock the ”on” “start” state..

I love all your apps but that one problem makes this one unusable. Check out Cable Guys Halftime pleaseee...

Will change to 5 stars as soon as that’s implemented 🙂

### 4/5 — Halftime

*2020-12-26*

Can we keep halftime on at all times in the next update? So I can just leave audio at half speed playback instead of having to record my slowed down audio into other apps. I get the idea but that would be a nice add on for the few users like myself that just needs a good app the resembles halftime by cable guys on the pc.

### 4/5 — Dope Fx

*2020-11-14*

The Fx would have gotten 5 stars if i didn’t have to set an automation on the power button to get it to work.

**Developer response:** There is no power button on this effect, just a start/stop button. Most DAW's stop audio flow when the transport is not running which is why the plugin enters stop state when the transport halts. We can't play historical audio at half speed if we don't have it.

### 4/5 — Real Downtempo Vibes

*2020-11-13, version 1.03*

The plugin sounds great and has a lot of extra effects to further affect the color and texture of the sound. Unfortunately, like with all 4Pockets apps, knobs movements are choppy. Despite my moving my finger in a linear matter, the knobs sometimes jump 20-50% of their range. I did not really encounter this in any other apps, plug-ins. 
Also in my setup (NanoStudio 2 on iPad mini) the horizontal windows of the plugin is very much squeezed in NanoStudio’s plugin tab. To be able to move any of the knobs, it is necessary to expand it (one extra click every time when accessing plugin controls). The most optimal would be if the plugins window could resize itself to more or less square format (if it’s possible from developers side). But making the knobs behave more predictably would be overall much more welcome improvement.

Thanks in advance.

### 2/5 — I like it BUT

*2020-10-30*

It’s not recording the effect when I render out or mixdown the effect is not on the track. In Cubasis Auria & Beatmaker 3 . Why is this happening? I’ll upgrade my ratings once this is rectified

**Developer response:** I've just performed a little test in Cubasis 3 using automation on the Start/Stop button and it was rendered into the mixdown correctly. Are you using Cubasis 3 and if so are you using parameter automation?

### 5/5 — Thank you bro

*2020-10-28*

Needed this 1. Real ones appreciate you bringing the halftime sauce to iOS.

Update: is it possible to make it where the host doesn’t have to be already playing for this auv3 to power on. I want it to be ready to go before I press play in the host app.

### 5/5 — Quick and easy to go slow

*2020-10-27, version 1.02*

Fantastic effects app. So many possibilities for all genres of music. Well, what are you waiting for. Don’t be slow, get it and GO!

### 5/5 — Update:

*2020-10-24*

No regrets I’ve been holding on some of the other apps but this one was a lot of fun. Great job

Possible to reduce clicking and pops when changing speed?

**Developer response:** The problem is the effect needs to resync to the next beat when changing speed as it the record buffer will be out-of-sync but I will look into ways to minimize this. Ideally the speed should be set prior to engaging the effect.

### 5/5 — Something different

*2020-10-23, version 1.0*

4Pockets have an uncanny knack for spotting a gap in the market, and filling that gap with something different. But difference would be no good if it did not also provide capable functionality. Happily, this is another winner, doing strange and sometimes wonderful things to rhythms.

Nic

## Frequently asked questions about SlowMoFX

### What is SlowMoFX?

SlowMoFX is an AUv3 audio plugin designed to create half-speed and other tempo-synced audio effects. It allows you to mix original audio with a slowed-down version, offering creative possibilities for sound manipulation.

### What devices does SlowMoFX support?

SlowMoFX is available for iPhone, iPad, and iPod. It functions as an AUv3 plugin, meaning it requires a compatible host application like AUM.

### How much does SlowMoFX cost?

SlowMoFX is a paid application priced at $9.99. There are no in-app purchases or subscription fees associated with its use.

### Does SlowMoFX have ads?

No, SlowMoFX does not contain advertisements. As a paid application, it provides an uninterrupted user experience.

### What are the different slowdown speeds available in SlowMoFX?

SlowMoFX offers several slowdown options, including 1.5x for generating triplets and syncopated beats, 2x for a standard half-speed effect, and 4x for a darker, more atmospheric sound.

### Can I automate parameters in SlowMoFX?

Yes, SlowMoFX supports parameter and MIDI automation for its main controls. This allows for dynamic and evolving soundscapes within your music productions.

### How often is SlowMoFX updated?

The latest version of SlowMoFX is 1.04, which was last updated on September 8, 2025. This indicates regular maintenance and potential feature additions.

### What is the user sentiment for SlowMoFX?

Based on 13 ratings, SlowMoFX has an average rating of 3.7 stars. This suggests a generally positive reception, though there is room for improvement.

## Version history (last 5 releases)

### 1.04 — 2025-09-08

v1.04 B16
Updated for compatability with future iOS versions.

### 1.03 — 2020-11-05

Added a new TimeSlip mode.
Added the ability to automate the play mode and glide.
Other small bug fixes.

### 1.02 — 2020-10-27

Added a 32 beat loop length.
This version has much smoother transitions between speeds while loops are playing.
Fixed a crashing issue when running on really low tempos.
Other minor fixes.

### 1.01 — 2020-10-24

Added a MicroFade option to smooth buffer transitions.
Added an option to completely disable MIDI control (handy for those DAW's that send all notes off).
Fixed an issue with the pitch shift effect which prevented full mix.

### 1.0 — 2020-10-22

No release notes.

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All apps by Limelight Software: https://appshunter.io/developer/370131860

## Related topics

[slowmofx](https://appshunter.io/ios/topics/slowmofx)

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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 2026-07-07.*