Checklist: evaluate any free compressor in ten minutes
Before you commit a new compressor to your templates, run it through a short test. This checklist works for the LALA compressor plugin or any similar free tool, and it saves you from months of mixing with a plugin you half-trust.
1. Confirm it is genuine and current
- Download from the developer's own page or a well-known store. Check price and version there.
- Scan the installer as you would any download, and skip anything that arrives as a random zip.
- Note the plugin format (VST3, AU, AAX) so you load the right one in your DAW.
2. Check latency and stability
- Load it on five tracks at once. If your DAW crackles, raise the buffer or note the CPU cost.
- Save and reopen your project. Settings should recall exactly.
3. Test transparency at zero gain reduction
- Insert it, set threshold so nothing is compressed, and match levels.
- Flip bypass. Any tone change tells you the plugin colors the signal even at rest, which is fine for character compressors but worth knowing.
4. Test it on three sources
| Source | Setting to try | What to listen for |
|---|---|---|
| Vocal | 3:1, medium attack, 3 dB reduction | Consistent level, natural breaths |
| Snare | 4:1, slow attack, 4 to 6 dB | Punch retained, tail lifted |
| Bass | 4:1, medium attack, 3 to 5 dB | Steady low end, no distortion |
5. Test extremes
Push the input or ratio to the limit for ten seconds. This shows the character of the compressor: pumping, saturation or clean flattening. A tool that sounds good when overdone is a useful creative option.
Worked example: drum room mic squash
- Send the room mic to its own bus.
- Set ratio high (8:1 or above), fast attack, medium-fast release.
- Drive 10 to 15 dB of reduction on hits.
- Blend the compressed room under the dry kit at low volume. The result is size without cymbal wash.
What to do if it sounds bad
- Pumping: release too short. Lengthen it.
- Dull: attack too fast. Slow it down.
- Distortion: input too hot. Lower input and use output gain.
- Nothing happens: threshold too high, or the plugin is bypassed by an automation lane.
Where it fits in a chain
A common flow is EQ to clean, compressor to control, then EQ to shape. For deeper background, read how compressor controls work, then set proper levels using the gain staging guide. You can compare it with an optical-style free compressor to hear the difference in behavior.
Second worked example: bass guitar sustain
Record or load a DI bass with uneven notes. Set a 4:1 ratio, attack around 20 ms so the pluck survives, and release around 100 ms. Lower the threshold until the loudest notes show 4 dB of reduction, then raise output gain to match. Notes should now sustain evenly. If the compressor reacts to low fundamentals, try a side-chain filter if available, or high-pass a duplicate track feeding the detector.
Genre tips
- Pop vocals: gentle, 3 dB, to keep the top line steady.
- Funk drums: longer attack to keep snap, fast release for groove.
- Acoustic guitar: low ratio 2:1 and slow attack for natural dynamics.
Blind test steps
- Duplicate the track, compress one copy, and mute alternately with the DAW's solo group.
- Have someone else toggle, or use your DAW's random mute feature.
- Write which version you preferred before you find out which is which.
If your session gets heavy
Count how many compressors are active. If more than a third of your tracks have one, ask whether volume automation would do the job instead.
Third example: taming a loud snare
Set a 6:1 ratio, fast attack of about 5 ms to catch the crack, and a release of 60 ms. Aim for 5 dB reduction. The snare will feel more controlled, though possibly duller; add 1.5 dB at 5 kHz afterwards to restore snap. If it now sounds small, slow the attack instead and keep the release short so the tail rises.
Setting up a template
- Save three presets: gentle, medium and heavy.
- Name them by intended source rather than by numbers.
- Update them after each project so they reflect what you really used.
Signs the plugin is a keeper
You reach for it without thinking, your settings are repeatable, and mixes translate better on other speakers. If none of that is true after a week, remove it from your favourites and free up space for something else.
Last check: save your project, close it, reopen it and confirm the compressor recalls threshold and ratio exactly. Then render a short file and compare it with real-time playback; any mismatch points to a plugin that behaves differently offline, which you would rather learn now than at export time.
FAQ
Is a free compressor as good as a paid one?
Some are. Judge with level-matched tests rather than the price tag.
Do I need a different compressor for each source?
Not necessarily. One versatile compressor with sensible settings can handle most jobs.
How can I tell if it is colouring my sound?
Bypass test at zero gain reduction, with levels matched. Any tone change means colouring.
LALA by Analog Obsession
