Valhalla's expansive Supermassive reverb/delay plugin has just been updated, adding two new reverb modes named Orion and Casseopia. We included it our roundup of essential free effects not long ago. Here's what they have to say:
These are WEIRD reverb algorithms, based on some advanced extensions of Michael Gerzon's feedback delay network theory. Both Orion and Cassiopeia can sound quite sparse at the beginning of their decay, but can quickly build in echo density with non-zero settings of the Density control. The Density control also has a lot of influence on the reverb decay, with high density settings resulting in very long decays regardless of the Feedback setting.
Cassiopeia is the "smaller" of the two algorithms. In general, you will get shorter decays and echo patterns when using Cassiopeia, compared to Orion. One of my favorite settings is to set Warp to 0%, and use Density and Feedback to get echos that have a noticeable pulse on every 4th repeat. In this piece, I'm using 2 instances of Cassiopeia, once for a reverb that starts sparse and gets denser, and another for the pulsing repetitive echo.
Orion is "twice as big" as Cassiopeia under the hood, but this results in much longer reverbs and echoes than Orion, due to some laws of reverb physics that are a mystery even to me. Set Orion to the same settings as listed above for Cassiopeia, and you can get a mysterious echo that has a noticeable pulse on every 8th repeat. Turn up the Warp and Density values, and you will get truly massive modulated reverbs that can last for upwards of several minutes. Here's an example of a single Orion instance used to get a long modulated looping echo:
For more info and to get your hands on the free download for Mac/Windows head over to their blog: https://valhalladsp.com/2021/11/22/valhallasupermassive-1-5-0-update-two-new-reverb-modes/
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