How to de-ess vocals in Reaper

Reaper doesn't ship a plugin called "De-Esser," but it gives you a stock multiband compressor — ReaXComp — that de-esses cleanly once you know which band to touch. If you've been searching the FX browser for a de-esser and coming up empty, this is the answer. Here's how to de-ess vocals in Reaper with the stock tools, and where you'd want something that follows the ess for you.

Key Takeaways

• Reaper has no dedicated de-esser, but ReaXComp (its stock multiband compressor) does it — compress only the high band.
• Add a band over the sibilant region, solo it to confirm, and compress just that band.
• Set the amount on the harshest word, then check the vowels stay open.
• ReaXComp is frequency-fixed and level-triggered; a phoneme-aware plugin tracks the ess.

Which Reaper plugin to use

Reach for ReaXComp, Reaper's built-in multiband compressor. It splits the signal into frequency bands and compresses each one independently, which is exactly what de-essing needs: pull down the sibilant high band and leave the rest of the voice alone. Drop it on the vocal track, before any bright EQ or saturation. (ReaEQ can do a dynamic-ish version too, but ReaXComp is the cleaner path.)

De-essing in Reaper, step by step

1. Make a high band over the esses. In ReaXComp, set a band split so the top band covers roughly 5 to 9 kHz — where the sibilance lives, varying with the voice. Bypass compression on the lower bands for now.
2. Solo the high band. ReaXComp lets you solo a band — do it, and play the vocal. The esses should jump out. Nudge the split until they're the loudest thing you hear.
3. Compress only the top band. Lower that band's threshold until it ducks the sibilant peaks, with a fast attack and a quick release so it grabs the ess and lets go before the next syllable.
4. Set the amount on the worst word. Bring the reduction down until the hardest ess stops biting, then stop. Tuning to the worst case keeps the quieter esses from lisping.
5. Un-solo and check the vowels. Play a phrase with long open vowels — they should be untouched. If they dim when the singer opens up, your split is too low or the threshold too aggressive.

That's the whole method, and it's identical in spirit to every other DAW — the Logic, Pro Tools, Ableton, and FL Studio versions differ only in the plugin. The reasoning is in the complete guide to de-essing.

Where ReaXComp runs out

ReaXComp de-esses well, but it carries the limits of any frequency-fixed, level-triggered tool:

• The ess moves; your band doesn't. Sibilance shifts word to word, so a fixed band is slightly wrong on half the words — under-treating some, over-treating others.
• It reacts to level, not the phoneme. A bright vowel or a breath can trip the high band, because it can't tell a consonant from any other loud high sound. That's the dulling you hear.

A phoneme-aware de-esser like Sibilance closes both gaps: it classifies the consonant and follows where the ess actually is, so it acts on the ess and leaves the vowel's air intact — transparency you can measure rather than trust. It runs as VST3/CLAP in Reaper, with a free tier to A/B against your ReaXComp chain.

The short version

In Reaper, use ReaXComp: add a high band over the sibilant region, solo it to confirm, compress only that band with a fast attack and release, tune on the worst word, and protect the vowels. It'll smooth most vocals — and when you'd rather the tool follow the ess than hold one fixed band, a dedicated de-esser takes it the rest of the way.

Sibilance is the single-authority de-esser this comes from — a real free tier, and a 7-day Pro trial with no card.

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