by Amalgamated Signals

Nepenthe is a reverb designed to be smooth, transparent, and easy to use.

Nepenthe's algorithm is based on the concept of velvet noise. Rather than building echoes with a network of delay lines, it uses a predetermined set of randomly-generated echoes. This is a very simple design, which works well with modern CPU optimizations, so Nepenthe runs efficiently.

Nepenthe is open source, and its code is annotated with detailed explanations of the design.


Electric piano — dry
Electric piano — with Nepenthe
Saxophone — dry
Saxophone — with Nepenthe
Drums — dry
Drums — with Nepenthe

Download and donate

Donate to support development. Nepenthe is free to download with no restrictions, but developing and hosting it costs money, so please contribute!

Download Nepenthe AU/VST3 for Mac.

Download Nepenthe VST3 for Windows.

Download Nepenthe source code.

Screenshot of Nepenthe


Time is how long it takes, in seconds, for the reverb to decay by 60dB.

Delay specifies the pre-delay time, in milliseconds.

Bass controls the low-frequency content of the reverb.

Treble controls the high-frequency content of the reverb.

Width controls the stereo width of the reverb.

Mix controls how much reverb is mixed with the dry signal.

Questions and bug reports