Introduction
SignatureRVB is a professional stereo reverb effect designed as an AUv3 audio unit extension. Built on a Freeverb-style algorithm with 8 parallel comb filters and 4 series allpass filters per channel, it delivers rich, musical reverberation from small rooms to large halls.
The plugin runs inside any AUv3 compatible host on iPhone and iPad, with full preset and automation support.
Freeverb Algorithm
8 comb filters + 4 allpass filters per channel — classic Schroeder/Moorer architecture.
Pre-Delay
0–100 ms pre-delay separates the dry signal from the reverb onset.
6 Rotary Controls
Hardware-style knobs with professional graduation marks.
Zero Latency
Zero allocation on the audio thread. Real-time safe.
Requirements
Minimum iOS: 16.0
Plugin format: AUv3 Audio Unit Extension (aufx)
Host app required: AU EngineCore or any AUv3 compatible host
Getting Started
SignatureRVB is a plugin, not a standalone application. You need an AUv3 host to use it.
In AU EngineCore
NobodysBanda: SignatureRVB from the Effects category.In Other Hosts
Look for SignatureRVB in the audio unit browser under the Effect category, manufacturer NobodysBanda.
Interface Overview
The SignatureRVB interface features six rotary knobs arranged in two rows of three. Each knob is surrounded by graduation marks with numeric labels at key values.
Signal Indicator
A green LED in the top-right corner lights up when audio signal is present at the input, confirming the plugin is receiving audio.
Knob Interaction
Controls
Signal Path
Comb Filters
The 8 comb filters run in parallel. Each stores a delayed copy of the signal and feeds it back through a low-pass filter controlled by DAMP. The feedback amount is set by DECAY, and the delay times are scaled by SIZE. Left and right channels use slightly different delay times (stereo spread of 23 samples) to create natural stereo diffusion.
Allpass Filters
The 4 allpass filters run in series after the comb filter bank. They add additional diffusion and density to the reverb tail without coloring its frequency response (allpass filters have flat magnitude response). Fixed feedback of 0.5 per stage.
Pre-Delay
A circular buffer before the reverb network delays the wet signal by 0–100 ms. The dry signal bypasses this delay and reaches the output immediately, creating the perceptual impression of distance between the source and the reflective surfaces.
Stereo Width Matrix
The final wet signal is mixed with a stereo width matrix:
wet2 = wet × (0.5 − width/2)
output_L = dry × input_L + wet1 × reverb_L + wet2 × reverb_R
output_R = dry × input_R + wet1 × reverb_R + wet2 × reverb_L
Presets & Automation
All six parameters are fully automatable AUv3 parameters. Any AUv3 host that supports preset saving can store and recall complete SignatureRVB settings.
Automatable Parameters
Technical Specifications
| Plugin format | AUv3 — Audio Unit v3 Extension (aufx) |
| Manufacturer code | NbBa |
| Subtype | SRVB |
| Algorithm | Freeverb — Schroeder/Moorer |
| Comb filters | 8 per channel, parallel, with LP damping in feedback |
| Allpass filters | 4 per channel, series, feedback = 0.5 |
| Stereo spread | 23 samples offset between L and R comb delays |
| Pre-delay range | 0–100 ms (max 9 700 samples at 96 kHz) |
| Decay range | Feedback 0.50–0.95 (mapped from 0–100%) |
| Size range | Room scale factor 0.50–0.99 (mapped from 0–100%) |
| DSP precision | Single-precision (32-bit) buffers; float processing |
| Latency | Zero samples |
| Tail time | 10.0 seconds (reported to host) |
| Audio I/O | Stereo in, Stereo out |
| Thread safety | Atomic parameter updates; zero allocation on audio thread |
| Minimum iOS | 16.0 |
| Supported devices | iPhone and iPad (Universal) |
Tips & Best Practices
Start with SIZE, then DECAY
Set SIZE first to define the space character, then raise DECAY until the tail feels musical. Stay below 75% DECAY to avoid an overly washy sound.
Use DAMP for warmth
Raising DAMP (50–70%) simulates the natural high-frequency absorption of walls, carpets, and furniture. The reverb tail becomes progressively darker, sitting behind the dry signal in the mix.
PRE-DLY on vocals
A pre-delay of 20–30 ms preserves the clarity of the initial transient while still adding space. The brain perceives the dry sound first, then the reverb — just like in a real room.
WIDTH on dense mixes
Reduce WIDTH to 40–60% to keep the reverb out of the center of the stereo image, leaving room for kick and bass. Full WIDTH (100%) works well on pads and ambient sounds.
Send vs. Insert
On a send bus, set DRY/WET to 100% (fully wet) and control the amount from the send level fader. On an insert, use DRY/WET between 15–40% depending on the effect depth desired.
Stack with SignatureDLY
Insert SignatureDLY before SignatureRVB. The pre-delay of the reverb doubles as a tempo-sync point — set the DLY TIME to a quarter note value, then the RVB PRE-DLY to 0 ms for a rhythmic reverb effect.
Starter Presets
Drum Room: SIZE 35% · DECAY 30% · DAMP 25% · PRE-DLY 5ms · WIDTH 85% · DRY/WET 30%
Ambient Pad: SIZE 80% · DECAY 75% · DAMP 65% · PRE-DLY 0ms · WIDTH 100% · DRY/WET 50%
Small Hall: SIZE 60% · DECAY 55% · DAMP 45% · PRE-DLY 15ms · WIDTH 80% · DRY/WET 35%
Support
SignatureRVB is developed and maintained by Antonio Sorin TASU under the #nobodysbanda brand.
Contact
Website: nobodysbanda.ro
When Reporting an Issue
- Device model and iOS version
- Host application name and version
- Description of the issue and steps to reproduce it
- Whether the issue occurs consistently or intermittently