BSRI introduces Geometry Stacks analog flanger pedal
May 18, 2026 · 2 sources
BSRI has introduced the Geometry Stacks, an analog flanger, listed on the maker's site at $279.001. Delicious Audio reported the pedal on May 18, 20262.
The circuit runs on bucket brigade devices, the maker says, and the pedal adds a second one on demand. The Extend switch "Cascades an additional bucket brigade device into the modulation path for more dramatic flanging effects"1. BSRI writes that designing a flanger meant solving "some tricky problems to solve if you want the real short delay times and a wide sweep"1.
The controls, as described by BSRI1:
| Control | Function |
|---|---|
| Level | Volume of the modulated signal mixed into the output |
| Polarity (toggle) | Polarity of the modulated signal at the mix stage; down is in phase for classic flanging, up is out of phase for a hollow or tubular sound |
| Velocity | Modulation frequency, from very slow to very fast |
| Width | Range the modulation sweeps, narrow to wide; at maximum the Delay control has no effect |
| Voice | Active shelving treble boost/cut |
| Enhance | Amount of signal returned to the start of the BBD for regeneration; can self-oscillate at maximum |
| Delay | Amount of delay the modulation works around; at minimum Width it allows manual sweep |
| Activate | True bypass soft-click foot switch |
| Extend | Cascades an additional bucket brigade device into the modulation path |
BSRI cautions that the Enhance control "can cause self-oscillation at maximum so be careful!" and that it "gets loud at extremes"1. Delicious Audio describes the pedal as "an analog flanger that feels less like an effect and more like a piece of malfunctioning space station equipment"2.
"Geometry Stacks opens up many little modulation universes that can be delicate and subtle or mechanical and extreme."
The Geometry Stacks sits among the flanger pedals currently on the market.
Sources (2)
- Geometry Stacks | Analog Flanger | BSRI Audio, bsriaudio.com
- New Pedals: BSRI Geometry Stacks Flanger | Delicious Audio, delicious-audio.com