Chapter 12
Mixer effects, one by one
Every mixer effect, grouped by what it does, with every setting and range.
Written in our own words from the Koala manual’s effects chapter. The Koala manual
Control level and punch
All five react to how loud a signal is, so the choice comes down to the job. Use COMPRESSOR to even out a sound and, with its timing controls, to change how its transients hit. CLIPPER is the blunt one, slicing peaks flat for extra loudness and bite. LIMITER is a lookahead design intended for mastering. NOISE GATE deals with the quiet end, shutting out whatever falls under its threshold. And SIDECHAIN is a compressor steered by another signal, for when one sound should make room for a different one.
COMPRESSOR.MAKEUP
Switches makeup gain, which in general terms gives back the level that compression takes away.
Range on/off
CLIPPER.IN
Gain on the way in. Turn it up to hit the clipper harder.
Range -36–36 dB
LIMITER.GAIN
Turns the signal up or down at the limiter.
Range -18.0–18.0 dB
NOISE GATE.THRESHOLD
Anything quieter than this gets shut out.
Range -60–0 dB
SIDECHAIN.SOURCE
The signal doing the controlling: the mic or one of the buses.
Range MIC, BUS A–D
From the community
High Level Koala Ep. 2: Signal Flow & Mixing Drums in Koala Sampler
John Robinson
Signal flow from pad to bus to master, then a drum bus chain of EQ, compression, drive, bitcooker and limiter, with the reasoning behind each.
The best and worst built-in Koala effects, how to use them, and what they sound like
small plates music
A frank tour of the bus effects: how to use them, how they sound and which are best and worst. From 2025, so the isolator and plate reverb aren’t in it.
Shape tone with filters and EQ
These six all work on frequencies, and they run from simple to elaborate. LO-CUT and HI-CUT do one thing each, removing what’s under or over a point you set. BANDPASS keeps one band and loses the rest. EQ is for shaping tone across three bands. FILTER is the one to pick for movement, with several filter types, an envelope follower and an LFO. ISOLATOR is DJ-style, with a level for each of three bands that can drop away to nothing.
EQ.LOW SHELF/HI PASS
The bottom band, whose name gives its two roles: a low shelf or a high-pass filter.
Range -18–18 dB
FILTER.FILTER TYPE
Picks the kind of filter, including the more vocal Talkbox and Wah Wah.
Range Lo-pass, Hi-pass, Talkbox, Wah Wah
BANDPASS.FREQ
Where the band that gets through sits in the frequency range.
HI-CUT.FREQ
The point above which frequencies get filtered out.
Range 50 Hz to 20.0 kHz
LO-CUT.FREQ
The point below which frequencies get filtered out.
Range 50 Hz to 20.0 kHz
ISOLATOR.LO, MID, HI
One level for each band. Right at the bottom, the setting reads CUT.
Range 0–100%
From the community
The best and worst built-in Koala effects, how to use them, and what they sound like
small plates music
A frank tour of the bus effects: how to use them, how they sound and which are best and worst. From 2025, so the isolator and plate reverb aren’t in it.
Add echoes and space
Two echoes and two spaces. Pick DELAY for precision: separate left and right times, tempo sync and a filter of its own. Pick TAPE DELAY for character, as it imitates analogue tape loops and lets you dial in some wow. For space, FREEVERB is the basic choice, while PLATE REVERB has a dense, bright tail and more to adjust, including decay time and pre-delay.
DELAY.DELAY
The time between repeats, set separately for LEFT and RIGHT. It runs in bars with TEMPO SYNC on.
Range 0 ms to 2.50 sec / 1/64–8 bars
TAPE DELAY.DELAY
The time between repeats.
Range 10.0 ms to 2.50 sec
FREEVERB.SIZE
How big the space is.
Range 0.0000–1.0
PLATE REVERB.DRY/WET
The balance between your original sound and the reverb.
Range 0–100%
From the community
The best and worst built-in Koala effects, how to use them, and what they sound like
small plates music
A frank tour of the bus effects: how to use them, how they sound and which are best and worst. From 2025, so the isolator and plate reverb aren’t in it.
Add movement and change pitch
These six add motion, or move the pitch. CHORUS is the first stop for widening and thickening a sound. FLANGER and PHASER are both classic sweeping effects, and the phaser adds a STAGES control. AUTOPAN shifts a sound around the stereo field. RING MOD is for the more extreme end, since ring modulation tends to sound metallic in general. PITCH SHIFT moves a signal up or down by as much as an octave, and lets you blend it with the original.
CHORUS.RATE
How fast the modulation runs.
Range 0.1–10 Hz
FLANGER.RATE
How fast the flanger sweeps.
Range 0.00000–20 Hz
PHASER.RATE
How fast the phaser sweeps.
Range 0–10 Hz
AUTOPAN. The screenshots in Koala’s manual label it AUTO PAN.DEPTH
How far the sound travels.
Range 0.00–100%
RING MOD.FREQ
The frequency of the ring modulation.
Range 1.0 Hz to 8.00 kHz
PITCH SHIFT.PITCH
How far to shift the signal.
Range -12 to +12 semitones
From the community
The best and worst built-in Koala effects, how to use them, and what they sound like
small plates music
A frank tour of the bus effects: how to use them, how they sound and which are best and worst. From 2025, so the isolator and plate reverb aren’t in it.
Add grit, wobble and voices
These four deliberately make things less clean. BITCOOKER gives digital damage, lowering the bit depth and sample rate with some jitter if you want it. DRIVE is straightforward waveshaping distortion. WARBLE copies the unsteady pitch of a turntable or cassette. VOCODER is the odd one out: it imposes the contours of a voice on a carrier sound, and the result is a talking pad or synth.
BITCOOKER.SAMPLERATE
The sample rate it reduces the signal to.
Range 800 Hz to 44.000 kHz
DRIVE.DRIVE
How hard you push the distortion.
Range 0.000–36 dB
WARBLE.VINYL
The record on screen. Hold it, and the audio pauses.
VOCODER.SYNTH
The carrier: the sound that gets shaped. VOICE SYNTH is the built-in synth, and THIS BUS is the audio on this channel.
Range VOICE SYNTH, THIS BUS
Key combinations
- Hold
VINYL - Pauses the audio until you let go.In WARBLE
From the community
High Level Koala Ep. 2: Signal Flow & Mixing Drums in Koala Sampler
John Robinson
Signal flow from pad to bus to master, then a drum bus chain of EQ, compression, drive, bitcooker and limiter, with the reasoning behind each.
The best and worst built-in Koala effects, how to use them, and what they sound like
small plates music
A frank tour of the bus effects: how to use them, how they sound and which are best and worst. From 2025, so the isolator and plate reverb aren’t in it.
Measure, tune and fix
These are tools more than sound effects, and each has one clear use. UTILITY handles quick fixes to a channel’s gain, phase and left or right signal. METER lets you see what’s going on, with peak, RMS and LUFS readings that go down to -90 dB. TUNER tunes an instrument from whatever signal is on its channel, and has nothing to set. MIC brings your microphone into the mixer. TEST TONE generates a signal to work with. STEREOIZER is the exception that does change the sound: it spreads mono out into wide stereo, and the low end stays in the centre.
UTILITY.CHANNEL
Which signal passes: stereo, only the left, only the right, or left and right together in mono.
Range Stereo, Left, Right, L+R Mono
METER.VU
VU meters, along with short-term, momentary and integrated LUFS.
TUNER.MIC.GAIN
Sets the level of the mic signal.
Range -18–18 dB
TEST TONE.PITCH
The frequency of the signal.
Range 20 Hz to 20 kHz
STEREOIZER.SPREAD
How wide the stereo image gets.
Range 0–100%
From the community
The best and worst built-in Koala effects, how to use them, and what they sound like
small plates music
A frank tour of the bus effects: how to use them, how they sound and which are best and worst. From 2025, so the isolator and plate reverb aren’t in it.
