RP-Delay is a unique delay with a particular focus on some very special features, including brand new FX routing which means the sound reverser can reverse the input, while simultaneously reversing one of the delay lines. The reverse sound can also be triggered via a MIDI keyboard, generating totally new sounds, and sending them into the reverser with its own filter and distortion.

RP-Delay allows users to have 6 delay lines with 8 active multi-mode filters all operating at once in each of several delay models. In addition to the basic delay models like a simple mono delay and a stereo delay, Rob Papen has also included a tape-sound delay allowing users to change tape length without any clicks. The delays, filters, and reverser can all be modulated by the built-in modulators and RP-Delay includes 4 modulation sequencers, 4 LFOs, and 4 envelopes, complete with several trigger options.

RP-Delay is included as part of RP-Verb or can be purchased as a separate plug-in.