Schroeder reverb is a type of digital audio effect that is used to simulate the natural reverberation that occurs in a physical space. It was invented by Manfred Schroeder, a German acoustician, in the 1960s. Unlike other types of reverbs, which use a single feedback loop to create a series of echos that decay over time, the Schroeder reverb uses a combination of both early reflections and a diffuse reverberation tail. Overall, the Schroeder reverb is a versatile and effective tool for adding depth and dimension to recorded music, and it remains a popular choice among musicians and audio engineers today.