A waveshaper is a type of audio processing module designed to alter the shape of an input waveform, thus changing its harmonic content and timbre. Waveshapers can transform simple waveforms, such as sine or triangle waves, into more complex and harmonically rich waveforms. This process can help create new and interesting sounds in a modular synthesizer.
Waveshaping techniques can include distortion, wavefolding, rectification, and other non-linear processing methods. Each method manipulates the input waveform differently and can produce a wide variety of sonic results. By using waveshapers in conjunction with other modules, such as oscillators, filters, and modulators, you can sculpt and design intricate and evolving sounds in a modular synthesizer setup.