A free compressor is only worth keeping if you can get a repeatable result from it in under two minutes. This page is a bench test plan for Deft Compressor: one session, three sources, fixed starting points, and a way to decide whether it earns a slot in your default template. The settings below are generic starting points for any compressor with threshold, ratio, attack, release and makeup controls, so map them onto whatever the interface offers.
Before you open the DAW
Grab the plugin only from the developer's own page or a store that lists the developer, and check there whether it is still offered at no cost, since giveaways come and go. Confirm your format (VST3, AU or AAX) matches your host, then rescan plugins. Skip anything from a random mirror: an installer you cannot trace is not worth a free effect.
The three-source bench session
Load a dry vocal, a drum loop and a bass line on separate tracks, each with a fresh instance of the compressor. Set all instances to bypass, then loudness-match by ear or with a meter each time you compare. Louder always sounds better, and compressors love to fool you with makeup gain.
Step 1: Vocal, tame the peaks
- Start with ratio around 3:1, attack 10 to 20 ms, release 80 to 120 ms.
- Lower the threshold until the gain reduction meter bounces between 3 and 6 dB on the loudest words.
- Add makeup gain until the bypassed and active versions match in level.
- Ask one question: are the syllables more even, or has the breath and sibilance jumped forward? If sibilance jumps, lengthen attack slightly or de-ess first.
Step 2: Drums, keep the punch
- Ratio 4:1, attack 30 ms or slower, release 50 ms, or auto if offered.
- Aim for 2 to 4 dB of reduction on the snare hits only.
- Slower attack lets the transient through; if the kick loses its click, slow it more.
Step 3: Bass, glue the notes
- Ratio 4:1 to 6:1, attack 30 to 50 ms, release 100 to 200 ms.
- Aim for steady 3 to 5 dB reduction so quiet notes stop disappearing on small speakers.
- If the low end pumps in time with the kick, lengthen release.
Starting-point table
| Source | Ratio | Attack | Release | Target reduction |
|---|---|---|---|---|
| Lead vocal | 3:1 | 10-20 ms | 80-120 ms | 3-6 dB |
| Drum loop | 4:1 | 30 ms+ | 50 ms / auto | 2-4 dB |
| Bass | 4:1-6:1 | 30-50 ms | 100-200 ms | 3-5 dB |
| Mix bus (gentle) | 2:1 | 30 ms | auto | 1-2 dB |
A/B verdict sheet
Score each source out of five on these points and keep the plugin if it averages four or better:
- Transients survive at slow attack
- No audible distortion at 6 dB of reduction
- Release recovers without pumping at your tempo
- Meter is readable and controls respond smoothly
- Low CPU use with ten instances
Common problems
- Sounds dull after compression: attack is too fast. Open it up.
- Clicks or crackles: raise the buffer size, or check for a fast attack on low-frequency material.
- Plugin missing after install: confirm the folder your DAW scans and rescan.
- Level jumps on every preset: the makeup gain is not automatic; match it manually.
Where it fits in a chain
Put a compressor after corrective EQ and before any tone-shaping EQ or reverb send. If your levels going in are hot, the compressor will react wildly; the fix is upstream, and the gain staging guide walks through it. For a hands-on walkthrough of another free option, see how to use Fruity Compressor, and for a vintage-flavoured alternative, read about the LAEA optical compressor.
Parallel compression, the two-minute version
Once the bench test is done, try a parallel setup on the drum loop. Duplicate the track or use a send, set the compressor hard (ratio 8:1 or higher, fast attack, release around 100 ms, 10 to 15 dB of reduction), then blend it under the dry drums until the room and tails come up without losing snap. Because the dry signal keeps its transients, you can be far more aggressive than on an insert. Watch for phase shifts if the plugin adds latency your host does not compensate; if the blend sounds hollow, nudge the delayed track earlier by a few samples.
Genre notes
- Hip-hop: slow attack on the drum bus so kicks knock, faster on the rap vocal to keep it upfront.
- Acoustic folk: low ratio, 2:1, and a long release; the aim is evenness, not audible squeeze.
- EDM: heavy sidechain-style pumping is intentional, so use a fast release timed to the tempo.
FAQ
What ratio should I begin with on a compressor I do not know?
Try 3:1 or 4:1 with a medium attack. It is gentle enough to hear the effect without squashing.
Should I compress before or after EQ?
Usually cut problem frequencies first so the compressor is not reacting to a boomy resonance, then boost for tone after.
How much gain reduction is too much?
On a vocal, beyond 8 dB most people hear pumping or lifelessness. Use two gentle stages instead of one heavy one.
One last note: check the developer's official page for current availability and price before you install.
