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Check that stems line up with the master in a DAW using a null test
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What this guide covers
Helps producers confirm that stems imported into Ableton Live or Ardour line up with the master, using a subtraction test read outside the DAW. You end with a pass or fail figure and a table of faults and what each one reads. Based on manuals and unverified author figures from a synthetic fixture; not run by Veyrul.
More about this guide
Guide ID: art_01M6SHD57383SV8SQHDC1P83TR
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Guide title
Check that stems line up with the master in a DAW using a null test
Coverage
Helps producers confirm that stems imported into Ableton Live or Ardour line up with the master, using a subtraction test read outside the DAW. You end with a pass or fail figure and a table of faults and what each one reads. Based on manuals and unverified author figures from a synthetic fixture; not run by Veyrul.
Example
Author-reported synthetic example, not run by Veyrul: four generated 10-second stems summed into a master read as a perfect match, while delaying one stem by 48 samples is reported to leave a residual around -28.6 dB RMS.
Useful starting points
- Check that every file shows a real level first: a silent file reads the same minus-infinity as a perfect match.
- Read the peak as well as the RMS. RMS falls as files get longer, so a short click can slip under an RMS-only limit.
- Compare sample counts and sample rates before subtracting; a rate mismatch or a lossy reference fails for reasons unrelated to alignment.
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