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 RP-1 by Numerical Audio is a Virtual Effect Audio Plugin and a Mobile Audio App and a Standalone Application. It functions as an Audio Units Plugin and a Standalone Application.
RP-1 RP-1
Product RP-1
Developer Numerical Audio
Price (MSRP)
$29.00(VST / AU) $5.99(iOS)
Type / Tags Delay / EchoModulation (Flanger / Phaser / Chorus / Tremolo)
Plug-in, App & Soundware Format(s)
Operating System Availability
Download Released
  Download Released
System Requirements
- Windows 7+
- VST compatible plugin host (32-bit or 64-bit)
  Download Released
System Requirements
Mac OS X 10.9+
  Download Released
System Requirements

RP-1 is a highly flexible stereo delay for iPhone and iPad that integrates with everything from Audiobus over Inter-App Audio to AudioUnit Hosts and of course Ableton Link. What's more, RP-1 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.
  • Standalone Application with support for USB Audio Interfaces.
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