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Delay / Echo Plugin by Numerical Audio
$29.00(VST / AU) $5.99(iOS)
RP-1 RP-1
RP-1 by Numerical Audio is a Virtual Effect Audio Plugin and a Mobile Audio App and a Standalone Application for macOS, Windows and iOS. It functions as an Audio Units Plugin and a Standalone Application.
System Requirements
- Windows 7+
- VST compatible plugin host (32-bit or 64-bit)
System Requirements
Mac OS X 10.9+
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7 KVR members have added RP-1 to 5 My KVR groups 9 times.
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KVR Rank

Overall: 9275   6718   8451   408

30-Day: 13210; 7-Day: 19341; Yesterday: 16592

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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