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Glue compression
Gazillion Industries ·
Eight drum tracks, all balanced, all in time, and the kit still sounds
like eight files instead of one performance. Everything is correct. Nothing is agreeing with
anything.
Glue compression is gentle compression across a group of tracks, so one gain cell moves for
all of them and the parts rise and fall together. On a drum bus that means a slow attack around
10 to 30 ms, a release timed to the tempo or set to auto, a low ratio of 1.5:1 to 2:1, and only
1 to 3 dB of gain reduction on the loudest hits. The shared movement is the effect. The gain
reduction is just how you get at it.
The short version
- Ratio
- 1.5:1 to 2:1
- Attack
- slow, 10–30 ms, so hits keep their front edge
- Release
- auto, or timed so gain is back before the next beat
- Amount
- 1–3 dB on peaks, and never all the time
- Where
- drum bus, instrument groups, mix bus
- Test
- level-matched bypass, listening to the quiet parts
What glue actually is
Put a compressor across a group and every element now controls the gain of every other
element. When the kick lands, the hats duck fractionally and come back. When the snare rings,
the ring lifts the whole bus a hair as the gain recovers. Those movements are small, shared and
rhythmic, and the ear reads them as one source in one space rather than several files in a
spreadsheet.
The same mechanism explains why heavy bus compression goes wrong so fast. A little shared
movement sounds like a band. A lot of it sounds like the kick is operating a light switch.
How to set a glue compressor
- Put the compressor on the group bus, after the individual tracks are balanced.
- Set the ratio to 2:1 and the attack to about 30 ms.
- Lower the threshold until the meter shows 1 to 3 dB of gain reduction on the loudest hits.
- Set the release so the needle returns to zero between beats, or use auto release.
- Shorten the attack only if the group feels detached from the beat.
- Match the make-up gain to bypass, and check the quiet bars rather than the drops.
At 90 bpm a quarter note is about 667 ms and an eighth is 333 ms, so a release of 200 to 300
ms on a drum bus is usually back in time for the next hit. Longer than the beat and the gain
never recovers, which is the flat, permanently squashed sound people blame on the compressor
rather than on the setting.
DRUGS is a
free one-knob bus compressor for drums, built for this job: DOSE makes the bus denser rather
than louder, and the release reacts to what is in front of it instead of asking you for a
number.
Glue on the mix bus
Same idea, less of it. On a full mix, 1 to 2 dB of gain reduction with a slow attack and an
auto release is plenty, and it works best if it was there while you were balancing, not bolted
on at the end. A compressor added after the mix is finished changes every decision you already
made, and you will spend the evening re-balancing to match it.
Loudness belongs further down the chain. Clipper
before limiter covers the part where you are actually chasing level.
Where it costs you
Glue trades separation for cohesion. The kick pushing the bus down is the effect working, and
it is also a hi-hat losing a little of its place. On sparse material the movement can turn into
audible breathing between hits, especially with a release near the beat length. And a bus
compressor with make-up gain is louder, so a quick bypass always flatters it. Match the levels
and listen to the bars where nothing much happens: that is where pumping shows up first.
Questions people ask
What is the difference between compression and glue compression?
Compression is the process; glue is one use of it. A compressor on a single track controls
that track. The same compressor across a group makes the whole group share one gain movement,
and that shared movement is what people hear as glue.
Can any compressor be a glue compressor?
Most can, with a low ratio, a slow attack and small gain reduction. What varies is how
forgiving the release and the knee are when several sources hit at once, which is why some
compressors take group duty better than others at the same numbers.
What type of compressor is best for glue?
One with a gentle knee, a low ratio available, and a release that suits the tempo, including
an auto setting. On a drum bus, the timing controls decide the result far more than the
circuit does.
How much gain reduction should a glue compressor do?
One to three decibels on the loudest moments, and nothing at all in the quiet bars. If the
meter never comes back to zero, the release is too long or the threshold is too low.
What DRUGS does
DRUGS is our free bus compressor with one macro control. DOSE moves the
transfer curve, the knee, the attack and the release together, so the density comes up without
the peak level moving much across the range of the knob. The release is adaptive and has no user
control: a hit gets the shorter time, so gain recovers inside the gap where pump is audible, and
sustained material gets the longer one, so it holds still rather than breathing. Auto-makeup sits
after the gain cell, so setting level cannot disturb the dynamics.
Eight files, one gain cell, and a kit that finally sounds like it was in the room together.
Keep reading
DRUGS — a one-knob bus compressor for drums, free for Mac and Windows.
One control called DOSE, with GAIN and a soft ceiling on the way out.
FREE DRUGS