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Pope Audio Dirty C

500-series Chorus Module By Neil Rogers
Published May 2022

Pope Audio Dirty C

Based on the chorus section of Roland’s classic RE‑501, this isn’t your average 500‑series module!

Pope Audio’s debut product was a classy 500‑series Baxandall EQ — we reviewed it back in SOS February 2021 — and it proved to be a hit. How do you follow something like that up? Well, with his second design, the intriguingly named Dirty C chorus module, designer Adam Pope says that he suffered from the equivalent of ‘second album syndrome’. Now, a chorus effect might not seem like a very obvious choice — but it becomes rather less surprising when you learn of Adam’s background of working on classic tape echoes at some of London’s most well‑known service and repair centres...

After more than 20 years spent carefully servicing vintage Roland tape echoes, he felt that the chorus section on the later models (the RE‑501 and SRE‑555) was a feature that deserved wider appreciation. The price of vintage tape echoes and vintage chorus stompboxes has rocketed in recent years too, and the combination of price and demand has made development of high‑end recreations such as this more viable commercially. The Dirty C, then, is essentially Pope’s take on the chorus section of the Roland RE‑501 Chorus Echo, but he’s included some extra features and functionality too. As with all 500‑series modules you’ll need a chassis both to power it and to provide the analogue I/O.

The chorus section on the original RE‑501 had a rather limited control set, with just an Intensity control allowing users to change the modulation rate of the effect. The Dirty C does come with instructions on how best to recreate that RE‑501 effect faithfully, but it also offers a number of additional controls, whose purpose I’ll explain as...

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