Drive, the signal journey and the brightness scale
Drive feeds the filter, the filter shapes everything after it, and a handful of controls move any sound between dark and bright. To finish the module, you will build a brass stab from scratch and play it like a horn section.
- Use Drive to feed the filter more harmonics
- Follow one note through the whole layer
- Build a brass stab from scratch and play it expressively
01Drive: more harmonics for the filter to shape
One control on the Filter 1 panel, Drive, acts just before the filter. It pushes the oscillators into a soft saturation, which squeezes the peaks of the wave and adds harmonics.
That order matters. A filter can only remove harmonics, never add them. Drive gives it more to work with. Driving a sound and then closing the filter gives the thick, warm tone of a hard-working analog synth. Driving it with the filter wide open gives grit and bite.
Drive adds harmonics before the filter
The triangle wave starts with only weak odd harmonics. At 100% Drive its peaks are flattened into a rounded square: the 3rd harmonic rises +9 dB, the 5th +12 dB. Now hear what that does through a dark filter (cutoff 700 Hz): the driven version has much more body and presence, even though the filter still hides the fizz.
Drive also compresses: loud and soft moments move closer together, so a driven patch feels louder and denser. Balance it with the layer Level. For stronger colors after the filter, such as Warm, Clip, Fold and Crush, see the Character panel in Module 9.
02The signal journey: one note through the whole layer
Every KiMiA layer processes each note in a fixed order, its signal journey. Knowing the order tells you which control to reach for:
Oscillators›Drive›Filter 1 (+ Filter 2)›Character›Amplitude envelope›Inserts›Level›Effects
Everything up to the amplitude envelope happens to each note separately. Then the layer’s notes meet, pass through its two insert effects (a chorus or a phaser, for example: Module 10), its Level, and finally the shared effects such as the reverb.
Below, one bass note (C2) is followed through that chain. Each tile is the same note rendered with every stage up to that point switched on. Press Play the journey to hear the sound grow stage by stage. In the online course you can play each stage and hear the sound grow.
One bass note (C2) traveling through layer A
-
1OscillatorsSaw + pulse + sub
-
2DriveDrive 35%
-
3Filter 1Low-pass 24 dB · 650 Hz · Res 35% · Env +45%
-
4CharacterWarm · drive 30% · mix 60%
-
5Amp envelopeA 4 ms · D 0.5 s · S 60%
-
6EffectsPlate reverb · 20%
- 1 → 2: Drive rounds the raw mix and makes it denser.
- 2 → 3: the filter makes the biggest change of all. Most of the upper harmonics are gone, and a resonant bump appears near its cutoff. Everything after this point can only be as bright as the filter allows.
- 3 → 4: Warm Character adds gentle saturation after the filter, so the sound gets fuller without getting fizzy again.
- 4 → 6: the envelope gives the note its shape in time, and the reverb puts it in a room.
03The brightness scale
When musicians call a sound dark, warm or bright, they are describing how much energy sits in the upper harmonics. Here is one saw, filtered at five cutoffs, from dark to brilliant:
The brightness scale: one saw, five cutoffs
The filter is your main brightness control, but not the only one. When a sound needs to move along this scale, these are the controls KiMiA gives you:
| Control | Darker | Brighter |
|---|---|---|
| Oscillator wave Edit › Subtractive | Sine, Triangle | Saw, Pulse |
| Cutoff Edit › Filter 1 | Lower | Higher |
| Slope Edit › Filter 1 | 24 dB | 12 dB |
| Resonance Edit › Filter 1 | Lower (smoother) | Higher (more focused) |
| Envelope amount Edit › Filter 1 | Less (static) | More (bright attacks) |
| Velocity → brightness Edit › Amplitude envelope | Soft playing | Hard playing |
| Key tracking Edit › Filter 1 | Less (high notes duller) | More (high notes keep their brightness) |
| Drive, Character Edit › Filter 1, Edit › Character | Less | More harmonics |
| Character Tone Edit › Character | Lower | Higher |
| Reverb Tone Edit › Reverb | Darker tail | Brighter tail |
| EQ High Play screen (your whole output, not part of the sound) | Cut | Boost |
And a first taste of the timbre dictionary in Module 20. Each word is a recipe you can already build:
| Word | What it is | Filter recipe |
|---|---|---|
| Dark | Very little above 1 kHz | Low-pass 24 dB, cutoff 200–600 Hz |
| Warm | Strong low and middle harmonics, soft top | Low-pass or Ladder 700 Hz–1.5 kHz, a little Drive |
| Bright | Plenty of energy above 3 kHz | Low-pass 12 dB, cutoff 4 kHz and up |
| Muffled | Even the middle is missing | Low-pass below the second harmonic |
| Thin | Little low end | High-pass 300 Hz–1 kHz |
| Nasal | A narrow bump in the middle | Band-pass or resonant low-pass around 800 Hz–1.5 kHz |
| Hollow | A gap in the middle | Notch around 1 kHz, or a pulse wave near 50% |
| Vocal | Peaks where a voice puts them | Vowel, Resonance 30–60% |
| Metallic | Harmonics that ring on and on | Comb, Damping 0–20%, high Resonance |
04Build it: a brass stab
Time to put the whole module to work. A synth brass stab is one of the best filter exercises there is. A real horn gets brighter the harder it is blown, and its tone opens up at the start of each note with a short “blat”. That is Touch → brightness and the filter envelope, exactly what you have just learned.
Here is your target:
- Start clean. Load 05 · Course Init. In Edit›Subtractive set Oscillator 1 and Oscillator 2 to Saw, Oscillator blend 50% and Detune 8 cents. Two slightly detuned saws give the “section” thickness.
- Shape the filter. In Edit›Filter 1: Type LP, Slope 24 dB, Cutoff 520 Hz, Resonance 18%, Envelope amount +55%. In the Edit›Filter envelope set Attack 60 ms, Decay 0.5 s, Sustain 40%, Release 0.25 s. The filter opens a little slower than the volume: that is the blat.
- Shape the volume. In Edit›Amp envelope: Attack 25 ms (brass never starts instantly), Decay 0.35 s, Sustain 75%, Release 0.22 s.
- Add the player. On Filter 1 set Touch → brightness to 2.5 octaves and Key tracking to 50%.
- Give it a room. In Edit›Reverb switch the reverb on: Type Plate, Mix about 20%, Pre-delay about 18 ms so the attack stays clear.
- Compare. Load 05 · Brass Stab and A/B it against yours. Adjust until you can’t tell them apart, or until you prefer yours.
Play short chords in the right hand, voiced close together (B♭–D–F, C–E–G), with the root in the left hand, like a horn section. Accent the off-beats hard and play the rest softly. Your velocity now decides which hits bite and which ones sit back: that is phrasing, not programming.
05Cheat sheet
| Control | What it does | Typical range | You hear |
|---|---|---|---|
| Type | Chooses the filter’s shape | LP for most patches; 15 flavors in Module 6 | Warm, thin, nasal or hollow |
| Slope | How steep the cut is | 12 dB open · 24 dB round | Edge versus smoothness |
| Cutoff | Where the cut begins | 30 Hz – 18 kHz | Dark ↔ bright |
| Resonance | Peak at the cutoff | 0–60% focus · 60–90% singing | Focus, “wah”, ringing |
| Key tracking | The cutoff follows the note | 0–40% basses · 50–100% leads | Even brightness across the keyboard |
| Drive | Saturation before the filter | 10–40% warm · 60–100% gritty | Density, warmth, bite |
| Envelope amount | How far the filter envelope moves the cutoff | +30% to +70% for plucks and brass | Bright attack, darker decay |
| Filter envelope | Its Attack, Decay, Sustain and Release shape the cutoff’s move | Struck: fast attack, sustain 0 | The strike and the bloom |
| Touch → brightness | Harder playing opens the filter | 1.5–3 octaves | Touch-sensitive tone |
| Filter 2 · Routing | A second filter, in series or in parallel | 1 → 2 for a band · Parallel for two peaks | Telephone, two peaks, crossing moves |
06Module check
07What’s next
You can now shape the tone of any sound, and make it respond to your playing. In Module 6 · Filter flavors you will meet the other fifteen types: the Ladder and the famous filter circuits of the 1970s and 80s, filters with one knob for many shapes, and filters that ring at a pitch or talk. Everything you learned here, cutoff, resonance, slope, envelope and touch, works on all of them.