Numerical Audio Intros RP-1 Dual Digital Delay For iOS


Numerical Audio has introduced RP-1, a flexible stereo delay for iPhone and iPad that supports Audiobus, Inter-App Audio, Ableton Link and more.

RP-1 also comes with a solid standalone application that makes real-time effects processing as simple as connecting a USB Audio Interface or singing into the internal microphone.


  • Two independent delay sections with flexible routing options and effect bypass
  • Long Delay for Echo type effects
  • Short Delay for Chorus, Vibrato & Flanger effects (Mod Frequency from 0.1hz – 10hz)
  • Lowpass and Highpass Filter
  • Delay times from 10ms to 2000ms in free mode
  • Delay times for 1/32th to 4bars when tempo synced
  • Tempo Sync via AU Host or Ableton Link
  • Tap Tempo and Manual Tempo
  • Normal, Dotted and Triplet mode
  • True Stereo Processing
  • Stereo Spread
  • Standalone operation with Mic Input or USB Audio
  • Audio Unit Extension
  • Inter App Audio support
  • Audiobus support
  • Ableton Link support

Audio demos are available at the Numerical Audio site.

Pricing and Availability

RP-1 (Universal Application) is available now for US $5.99 in the App Store. 

11 thoughts on “Numerical Audio Intros RP-1 Dual Digital Delay For iOS

  1. I just test it with aum and animoog no sound , with only the ipad mic and audiobus no sound … It seems nothing go in the input level does anyone has the same issue with the app ? Or i miss something ?

  2. I have an important question: what happens if I don’t want digital delay but analog?

    Another important question: what happens if I don’t want digital delay but reverb?

    Thank you

  3. There was a problem with the build uploaded to the app store. I downloaded it and it didn’t work properly. Contacted them right away and they are fixing it. Looks like a really great app once they get it sorted.

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