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

What's New

Version 1.3.3

- 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

Ratings and Reviews

Has become my favorite delay.


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.



Finally I found an app that works my phantom powered condenser mic and the sound quality is amazing so far I'm still im the beginning haven't used this yet but I know it work Great. Thank You👍🏻

Time Tool


The app works well on my iPad Air 2 and is very useful to have multiple instances in various sound chains.

Apple needs to have a standardized way of saving AU presets with all AU apps and AU hosts so we're not recreating presets every time we create our own presets in a different AU host app (e.g. AUM and Cubasis) and it should not fall upon the developer's to come up with a standard because Apple has so far failed to do so.


Kai Aras
27.4 MB
Requires iOS 9.0 or later. Compatible with iPhone, iPad, and iPod touch.
Age Rating
Rated 4+
© 2017 - Kai Aras


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