Mix Check - User Guide
Overview
Mix Check is an evidence-first audio measurement console. It reports what the uploaded signal actually measures and compares it only against a supplied reference or measured genre profile. It does not produce a quality score or pretend to replace listening.
Purpose
The goal is to give producers a reproducible measurement surface: decoded waveform, direct loudness and level readings, spectral deltas, and mono fold-down loss. The result is evidence for a decision, not an automated verdict.
Features
- Direct measurements: Integrated LUFS, sample peak, RMS, crest factor, channel balance, and DC offset.
- Spectral comparison: One-third-octave measurements with loudness-relative deltas.
- Reference matching: Compares against an uploaded WAV or MP3 reference when supplied.
- Genre profiles: Uses measured profiles as comparison context; it is not a genre classifier.
- Mono fold-down: Reports material adjacent-band loss only when the signal supports it.
- Mix and Master stages: Applies the documented comparison policy for the selected stage.
Supported File Formats
- Formats: `.wav`, `.mp3`
- Max File Size: 100 MB
- Max Duration: 6 Minutes (360 seconds)
- Max Sample Rate: 192 kHz
- Max Channels: 8
Inputs
- mix_object: The main track to be analyzed.
- reference_object (Optional): A commercial reference track for direct comparison.
- genre (Optional): Target genre profile.
- analysis_stage: "mix" or "master" (determines threshold rigor).
Outputs
- Loudness and level metrics: Integrated LUFS, sample peak, RMS, crest factor, and channel readings.
- Spectrum: One-third-octave band values and supported comparison deltas.
- Mono loss: Band-level fold-down evidence when material loss is detected.
- Visual data: Raw waveform envelope and spectrum data for the cockpit UI.
Access and daily quota
The tool receives membership identity from the SubverseLab website and does not
show a separate login screen.
- One analysis a day is free (one per IP address per UTC calendar day). After that, an analysis costs 100 credits, taken from your balance before the analysis starts and given back if it fails. Credits come with any plugin purchase: every dollar you pay for a plugin gives you 100 credits.
- Server-verified admins have no product usage quota.
- Failed or undecodable analyses release their reservation (or give back the credits) and do not consume the allowance.
Error Behavior
- 429 Too Many Requests: "Today's free analysis has already been used for this network. Please return tomorrow."
- 422 Unprocessable Entity: Returned if audio cannot be decoded, is corrupted, or exceeds duration/size limits.
Version Information
- App Version: 3.3.0
- Guide Version: 1.1.0
- Last Updated: 2026-08-25