FreqCheck™
Archival Processing
FreqCheck functions as a universal import layer, natively reading WAV, FLAC, AIFF, MP3, ALAC, and M4A audio at up to 24-bit / 384kHz — no proprietary desktop software, no conversion, no cost-prohibitive middle step between your file and your answer.
That means recordings sitting untouched for years — decades-old NVH records, legacy acoustic archives, field captures nobody's looked at since the day they were made — can be brought straight into the same certified engine used for live capture, and evaluated with the exact same mathematical authority.
Nothing you've already recorded has to stay unverified. What you're about to see below isn't a demo — it's proof you can run yourself.Import isn't a separate, lesser pathway anymore. The offline media engine has been rebuilt to mirror the live Pro Input Mode pipeline exactly, processing every imported file with the same full amplitude integrity and dynamic sample rate decoding that PIM applies to a live external feed.
That means a file you import and a signal you capture live through PIM run through identical mathematics, at identical resolution, with nothing about the offline path treated as secondary or approximate.
WHETHER YOU'RE CAPTURING LIVE OR AUDITING A FILE FROM YEARS AGO, THE MATH DOESN'T KNOW THE DIFFERENCE — AND NEITHER SHOULD YOUR CONFIDENCE IN THE RESULT.You may notice an 80 Hz test tone doesn't always report back as a clean "80.0" — and that's intentional. FreqCheck reports the true mathematical center of its FFT frequency bin rather than cosmetically rounding it, because a laboratory instrument that quietly smooths its own numbers for aesthetics has already stopped being a laboratory instrument.
For the complete mathematical breakdown of systematic digital offsets, see Patents & Technical. Read the Full Technical Disclosure →The original 384kHz / 32-bit float synthetic test files used throughout this page are available for direct download below. Import them into FreqCheck, then run the same files through your existing desktop DAQ environment side by side.
That means you're not being asked to trust a demo video — you're being handed the exact source file and invited to reproduce the result independently.
If the numbers match, you've verified the engine yourself. If they don't, you'll know exactly where to look.Because WAV carries audio in raw, uncompressed form, it gives the IND CORE™ engine the cleanest possible signal to work from — nothing lost, nothing pre-processed, nothing to second-guess.
That means WAV import is the truest baseline test of the engine's mathematical accuracy, with zero compression artifacts standing between the source and the result.
This is the file format lab instruments trust — and now, so can you.The engine natively unpacks FLAC directly into the FFT processing stream, preserving full dynamic range and sub-Hz structural telemetry while cutting file size dramatically.
That means large archives compressed for storage don't lose an ounce of analytical accuracy in the process — you get laboratory-grade precision at a fraction of the disk space.
Your archive gets smaller. Your evidence doesn't get weaker.FreqCheck processes 32-bit AIFF containers natively on the edge, giving immediate backward compatibility with legacy acoustic libraries and Apple-native sound engineering environments.
That means older archives built inside Apple's ecosystem — some going back years — don't need to be converted or re-encoded before they can be analyzed at full modern precision.
Old files. New standard. No translation required.The engine extracts exact structural mathematics from standard MP3 containers, aligning variable bitrates into strict, metrological FFT arrays natively on the device.
That means even a heavily compressed consumer file — the kind most tools would dismiss as too degraded to analyze seriously — still yields a mathematically defensible reading.
If the truth survives compression, FreqCheck will find it.Whatever the file, whatever its age, whatever compressed it — FreqCheck applies the same certified, NIST-traceable math to all of it.
Bring the file. Get the answer.