VINAIxds — Manual

01Overview

VINAIxds splits the incoming signal into four frequency bands with Linkwitz-Riley crossovers, then drives each band through its own distortion character — in parallel, so the clean and distorted energy sit together. A 2048-point real-time analyzer overlays input and output so you can see the harmonics you create, with the three crossover handles living right on the graph.

Each band carries the same five characters — Tube, Tape, Diode, Fold and LDX — and can be switched between Analog and Digital voicing. Distort the low end into a wall while keeping the highs glassy and clean.

02The interface

• Analyzer (top) — input vs. output spectrum overlay; drag the three crossover handles to set the band splits.
• Band strips (LOW · LOW-MID · HIGH-MID · HIGH) — each with its own character, Drive, Level, Dynamic and Proc/Mute/Solo/Delta.
• Global column (right) — Input, Oversample, Filter Mode (Analog/Digital), Mix, Output, Low Cut and Safe Clip.

03Knobs & buttons

Per band

Crossovers & global

04The five characters

05Under the hood

Signal flow

Input gain → Low Cut high-pass → polyphase-FIR oversampler → a four-way Linkwitz-Riley crossover bank → four parallel waveshaping bands → phase-aligned recombination → decimation back to base rate → global Mix → Safe Clip → DC blocker → output. The two FFT taps — one before the band split, one after recombination — feed the analyzer overlay; they sit off the audio path and never colour the signal.

• Crossover topology — Linkwitz-Riley filters split the spectrum into four bands. LR sections sum with flat magnitude and matched phase at each crossover, so the four bands recombine to unity when no drive is applied.
• Parallel band processing — each band runs its own waveshaper (one of five characters, Analog- or Digital-voiced) in parallel, not in series. Bands are phase-aligned before they are summed, so the recombined output stays coherent rather than smearing the splits.
• Oversampling & anti-aliasing — polyphase-FIR oversampling at 1× / 2× / 4× / 8× / 16× / 32× (default 4×) runs the nonlinear stages above base rate so the harmonics generated by heavy drive stay below Nyquist. Higher factors push the aliasing floor further down at proportionally higher CPU and latency; 32× is reserved for export (offline render), live playback caps at 16×.
• Latency & PDC — the linear-phase oversampling FIRs introduce a fixed group delay. That latency is reported to the host and PDC-compensated, so the wet path stays sample-accurate against the rest of the session; the reported figure scales with the oversampling factor.
• Metering — a 2048-point FFT drives the input + output analyzer overlay, so you read the harmonic content you add directly against the source spectrum. The analyzer taps are measurement-only and do not feed back into the audio.
• Output conditioning — the summed output is DC-blocked to remove any offset the asymmetric shapers introduce, then passed through the optional Safe Clip ceiling before it leaves the plugin.

06Measured

Measured in-house (headless host + numpy/scipy), 48 kHz.

07Specifications