Make Noise × Tom Erbe Plexiphon is a stereo Eurorack module in the Soundhack series — a collaboration between Make Noise and Tom Erbe, whose previous joint designs include Erbe-Verb, Echophon, and Mimeophon. The algorithm is written entirely from scratch on Make Noise's newest digital hardware, with no adaptation of prior code. Plexiphon belongs to neither reverb nor delay as a category — it is a modeless spatial texturizer that continuously morphs a network of feedback paths between dense reverberation and multi-tap echo without algorithm switching and without crossfading. Debut: Superbooth 2026, booth 0298. Shipping: June 2026. MSRP: $469 USD / €479.
Plexus: dynamic reconfiguration of feedback networks with no modes
The Plexus parameter is the architectural center of the algorithm — it simultaneously controls the number of feedback paths in the effect and the degree of their entanglement across frequency and time domains. At full counterclockwise, Plexus behaves like a room size parameter in a classic reverb — dense, diffuse spaces. At full clockwise, it operates as delay time in a multi-tap echo. The most interesting results occupy the space between those extremes, where the structure is neither: metallic blooms, smeared echoes, dense micro-reverb networks, and evolving unclassifiable spatial states. Size governs the temporal relationships between feedback paths — from room size to delay timing. Diffuse controls the softness or sharpness of the effect over time. Color adjusts the brightness or darkness of the tails. All parameters are fully voltage-controllable — no modes means no constraints on the modulation space. The Send gate input (normalled high, patchable via CV) determines whether and when the input signal enters the Plexus network, enabling gated washes, rhythmic bursts, and momentary reverb hits during performance.
Stereo Couple and Skew controls and envelope follower CV Out for system integration
Couple adjusts the degree of isolation or intermingling between L and R channels — from dual mono operation to a fully interlaced stereo field. Skew applies simultaneous inverse or tandem control of the left and right channel paths across Plexus, Size, and Color — producing asymmetric, animated stereo imaging without external modulators. The CV Out envelope follower tracks the amplitude dynamics of Plexiphon's output signal — usable for sidechaining the module's own parameters or as a modulation source elsewhere in the patch. Stereo inputs and outputs include mono sum normalizations, covering mono, semi-stereo, and full stereo configurations. Format: 16 HP, maximum depth 34 mm including power cable, current draw: 240 mA @ +12V, 5 mA @ -12V.
KEY FEATURES
- Stereo modeless spatial texturizer (no modes, no algorithm switching)
- Continuous morphing between multi-tap echo and reverb — widest range of results between the poles
- Plexus: simultaneous control of feedback path count and their mutual entanglement
- Size: temporal relationships between paths (room size ↔ delay time)
- Diffuse: softness/sharpness of the effect over time
- Color: darkness/brightness of the effect over time
- Couple: L/R channel isolation or intermingling (dual mono ↔ full stereo)
- Skew: inverse or tandem control of L/R on Plexus, Size, and Color simultaneously
- Send gate: CV-controlled signal entry into Plexus (normalled high, patchable)
- CV Out: envelope follower — for sidechaining own parameters or as system modulation source
- Stereo in/out with mono sum normalizations
- Full CV control of all parameters
- All-new code: Tom Erbe (Soundhack), Make Noise's newest digital hardware
TECHNICAL SPECIFICATIONS
- Format: Eurorack, 16 HP
- Maximum depth (including power cable): 34 mm
- Current draw: 240 mA @ +12V, 5 mA @ -12V, 0 mA @ +5V
- Audio I/O: stereo in (L/R), stereo out (L/R), mono sum normalizations
- CV In: Plexus, Size, Diffuse, Color, Couple, Skew, Send gate, Decay, Mix
- CV Out: envelope follower (output signal amplitude)
- Send gate: normalled high (patchable CV)
- Algorithm: entirely new code by Tom Erbe (Soundhack) on new Make Noise hardware
- Modes: none (modeless)
- Collaboration: Make Noise × Tom Erbe (Soundhack)
- Availability: pre-order open, shipping June 2026; Superbooth 2026, booth 0298
