# RP-1 Delay — Dual Digital Delay

> Dual stereo digital delay effect with modulation and looping capabilities. (iPhone/iPad app by Kai Aras.)

- Source: https://appshunter.io/ios/app/rp-1-delay/id1079530569 (this page in markdown: same URL + `.md`)
- Developer: [Kai Aras](https://appshunter.io/developer/370820899)
- Category: Music
- Price: $5.99
- Rating: 3.90/5 from 15 App Store ratings · 20 written reviews indexed
- Age rating: 4+
- Requires: iOS 9.0 · 13 MB
- Languages: American English
- Released: 2016-03-22
- Data updated: 2026-08-26
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/rp-1-delay/id1079530569/reviews.md

## What is RP?

RP-1 - Dual Digital Delay FX 

Two separate (stereo) delay lines allow for a wide range of effects ranging from basic slapback and ping-ping type echos to complex modulations and soundscapes. 

* Overview
- Digital Stereo Delay with High- and Lowpass filters, Stereo spread and Looping 
- Separate modulation Delay for Chorus, Vibrato, Flanger, Panning, Phaser & Tremolo effects
- Both sections can be bypassed individually
- Mod section can be routed pre or post delay 
- Delay Times from 10ms to 2000ms (or 1/32 to 2bars) 
- Tempo Sync via AudioUnit Host or Ableton Link 
- Tap Temp and Manual Tempo 
- Normal, Dotted and Triplet 
- Stereo Spread 
- Simple 1-Button Looping

* Connections
- AudioUnitV3 Effect
- Inter-App Audio Effect
- Audiobus (Filter)
- Ableton Link 
- USB Audio Interface
- Microphone

## Key features

- Dual stereo delay lines
- High- and Lowpass filters
- Stereo spread and Looping
- Separate modulation delay
- Tempo sync via AudioUnit Host or Ableton Link
- Delay times from 10ms to 2000ms

## Chart rankings

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

## Recent user reviews (10 of 20)

All indexed reviews: https://appshunter.io/ios/app/rp-1-delay/id1079530569/reviews.md

### 5/5 — IMHO- The Best Dual Digital Delay on IOS Period!

*2024-03-23*

I was looking and looking, already had BBD, already have Analog Delay, already had Tape delay, I couldn’t believe I already owned this Digital delay! So glad I did because, it truly is one of the best! IMHO, the best I found in IOS and universal AU as well. I will be using this in my pedalboard with ToneX plugin dual amp setup on my iPhone and analog drives pedalboard. 

I highly recommend this delay and supported by no other than one of the bet IOS developers!

MM4C

### 5/5 — Nice

*2020-11-01*

GarageBand built in guitar not working

### 3/5 — Problems with iOS 14

*2020-09-30*

Please this app have problems with iOS 14. I can not save preset

### 1/5 — Bug on update

*2019-08-20*

Unfortunately, after the 1.3.4 version update, the App crash every time I touch the rotary controls. I tried to contact support but they do not respond.

### 5/5 — Great Delay Effect

*2019-07-03*

Can’t go wrong with Kai Aras and Numerical.

### 5/5 — Deep Stereo Delay & Delay Modulation

*2019-01-28*

The Rotary slow panning preset sells this effect on its own - total spatial depth with a slight Doppler effect that’s unlike any other out there. There are undiscovered insanities in the app as well .. thinking the long dub delay effect. 
Considering it does every modulation delay effect from flanging to chorus and vibrato, with the ability to create multiple instances of multiple effects through the AU feature, it’s well worth it. 

For tape delay with all of the noise, flutter, and wow and ability to manually stop the reels in real-time, check out RE-1.

### 2/5 — Crashes

*2019-01-23*

This app worked great on my iPhone 6s but mysteriously crashes after launching just fine if I plug my headphones into my iPhone 8, despite having the most recent upgrades.

### 1/5 — does not work

*2018-08-10*

really - does not work !!!!

### 5/5 — Has become my favorite delay.

*2018-03-28*

I use this on my guitars mostly. It has this beautiful stompbox kind of simplicity that I like but all the sound of a studio rack unit. 
It works very well on acoustic guitars using the modulated delays

Recommended by me.

### 5/5 — Works great with new update

*2017-06-11*

Thanks. Sounds great.

## Frequently asked questions about RP

### What is RP-1 Delay?

RP-1 Delay is a digital stereo delay effect application that provides two independent delay lines for creating a wide range of echo and modulation sounds. It can be used as an AudioUnitV3 effect, Inter-App Audio effect, or with Audiobus.

### What kind of effects can RP-1 Delay create?

RP-1 Delay can generate everything from basic slapback and ping-pong echoes to complex modulations like chorus, vibrato, flanger, panning, phaser, and tremolo. It also includes looping functionality.

### Can I sync RP-1 Delay to my project's tempo?

Yes, RP-1 Delay supports tempo synchronization via AudioUnit Host or Ableton Link. You can also use tap tempo or manual tempo settings.

### What is the price of RP-1 Delay?

RP-1 Delay is a paid application, priced at $2.99. There are no in-app purchases or ads mentioned.

### What devices is RP-1 Delay compatible with?

RP-1 Delay is compatible with iPhone, iPad, and iPod touch. It has an age rating of 4+.

### How often is RP-1 Delay updated?

The latest version of RP-1 Delay is 1.4.3, which was released on April 14, 2022. This indicates it receives periodic updates.

### What is the user rating for RP-1 Delay?

RP-1 Delay has an average rating of 3.9 stars based on 15 ratings. This suggests a generally positive but mixed user reception.

### Can the modulation section be routed differently in RP-1 Delay?

Yes, the modulation section in RP-1 Delay can be routed either pre or post the main delay. This offers flexibility in shaping your sound.

## Version history (last 5 releases)

### 1.4.3 — 2022-04-14

Fixed an issue where the time control would not work properly when using tempo sync mode.

### 1.4.2 — 2020-10-05

- Fixed an issue where loading presets would not work when running on iOS14

### 1.4.1 — 2019-09-23

- Restored iOS9 support 
- Fixed an issue where the plugin would use the wrong sample rate in some cases resulting in improperly calculated timing

### 1.3.4 — 2019-07-03

- Added new preset browser
- Preset browser is now available in both, standalone and AUv3
- Use Presets are now shared between standalone and AUv3
- Minor visual tweaks
- Fixed an issue where some controls would not restore properly when loading a preset
- Fixed an issue where plugin parameters were not accessible for mapping or automation when running in a AUv3 host

### 1.3.3 — 2017-10-09

- Fixed UI issues when running in AU mode
- Fixed UI issues when running in AU in fullscreen mode
- Fixed an issue were tempo sync would not work properly in some cases

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## More apps by Kai Aras

- [MIDIBrute](https://appshunter.io/ios/app/midibrute/id1010753735)
- [RF-1 Reverb](https://appshunter.io/ios/app/rf-1-reverb/id1097763239)
- [VC-1 Chorus](https://appshunter.io/ios/app/vc-1-chorus/id1130683829)
- [Italizer](https://appshunter.io/ios/app/italizer/id1133091743)
- [VOLT Synth](https://appshunter.io/ios/app/volt-synth/id1185984394)

All apps by Kai Aras: https://appshunter.io/developer/370820899

## Related topics

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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 2026-08-26.*