For some, the ARP 2500 might be the holy grail of synthesizer history. Definitely rare, extremely impressive in its dimensions, sonically overwhelming and then as now a unique specimen. Built from 1970 to 1981, this dinosaur of analog synthesizers looks very tidy despite its modularity implemented throughout, thanks to the router system used. Behringer has reduced the modules to the compact Eurorack format and meticulously kept to the historical originals both functionally and sonically.

The Multimode Filter / Resonator 1047 from Behringer is an analog 12dB multimode filter with the four parallel outputs lowpass, bandpass, highpass and notch. The well gripping and round sounding filter goes decently into self-oscillation and then reaches the grainy resonance typical for ARP. By means of a fine control the cutoff can be tuned in detail (ideal for FM). For the notch output there is a separate control to tune the notch frequency. For cutoff there are two adjustable CV inputs, resonance can be modulated separately with CV.