A lead is the sound that carries the melody, the part a listener follows and hums back, so it has to be heard clearly over everything else. That takes two things: presence, so it sits forward in the mix, and character, so the tune is memorable. Here are the choices that build one, from the oscillator to the effects that place it.
This is about the sound itself, on any synth, in any DAW or a browser instrument. The melody it plays, the notes and their rhythm, is a separate job with its own guide.
A good lead sound is one that carries the melody and can be heard clearly over everything else in the mix. A lead is the part a listener follows, so it has two jobs at once: presence, meaning it sits forward and is easy to pick out, and character, meaning it has a tone of its own that makes the melody stick. In practice a lead usually lives in the mid to upper range where the ear tracks a tune most easily, it is bright and rich in harmonics so it cuts, it often plays one note at a time so the line stays clear, and it is given its own space in the mix so nothing masks it.
A lead patch is a short chain of choices, much like any synth sound. You pick an oscillator for the raw tone and size, thicken and widen it with unison and detune, shape its brightness and movement with a filter and a filter envelope, set whether it plucks or sings with the amp envelope, and place it with effects. If the oscillator, filter and envelope are new to you, the what is a synthesizer guide walks through the whole signal path. The table below is the map for the rest of this page.
| Part | What it decides | Rule of thumb |
|---|---|---|
| Oscillator | The raw tone and how big it is | Saw or a stacked supersaw for big and bright, square for hollow, sine for clean |
| Unison and detune | Width and thickness | A few voices, detuned a little, to fatten a thin wave |
| Filter and envelope | Brightness and movement | Open enough to cut, with a filter envelope so notes move |
| Amp envelope | Whether it plucks or sings | Short and sharp for stabs, long and held for a singing line |
| Mono, poly and glide | Focus and expression | Mono with glide for a single line, poly for stacked leads |
| Effects | Where it sits | Reverb and delay for space, saturation for presence |
One thing to separate early: this page is about the lead sound, the patch itself. The melody it plays, the actual notes and their rhythm, is a different job. If that is what you are after, the how to write a melody guide covers it. A strong sound and a strong melody are two separate wins, and you can work on them one at a time.
It depends on the size and character you want. For a big, bright lead, start with a sawtooth, or several detuned saws stacked together into a supersaw, which is full of harmonics and sounds large. For a hollow, reedy or retro lead, reach for a square or a pulse. For a clean, pure, whistle-like lead, a sine or a triangle. Whichever wave you pick, a few settings turn it into a lead: unison and detune to thicken and widen it, the filter and its envelope for brightness and movement, and the amp envelope for whether the line plucks or sings.
| Waveform | Character | Good for |
|---|---|---|
| Sawtooth | Bright and buzzy, every harmonic present, the fullest wave to work with | Big cutting leads, and the supersaw when several are stacked |
| Supersaw | Several detuned saws layered together, wide and huge | Trance and festival leads, anything that has to sound large |
| Square | Hollow and woody, odd harmonics only, a clear reedy edge | Reedy, retro and game leads, chiptune tones |
| Pulse | A narrowed square, thinner and more nasal | Focused, cutting mid leads that sit above the rest |
| Sine or triangle | Pure and round, few or no harmonics | Clean whistle leads and soft, simple melodic lines |
Unison stacks several copies of the oscillator and detunes them slightly against each other. The small pitch differences beat against one another and turn a thin single wave into a wide, shimmering, thick sound. This is how the classic supersaw lead is built. A little detune fattens the tone; a lot makes it wide and starts to sound out of tune, so it is a taste control you dial in by ear. Widening a lead this way is often what separates a big lead from a small one. One caution: heavy unison spreads energy across the stereo field, which can thin out if the sound is later summed to mono, so it is worth checking in mono before you commit.
Raw saws are bright, and a low-pass filter sets how much of that top you keep. For a lead you usually want the filter fairly open so the sound cuts, but a filter envelope, where the cutoff opens on the attack and settles back as the note holds, gives that expressive swell as each note starts. Point an envelope or a slow LFO at the cutoff and the tone keeps moving while it plays, which stops a held lead from sounding static and lifeless. How far you push it is a style choice, from a subtle lift to an obvious sweep.
The amp envelope decides whether the lead stabs or sustains. A fast attack with a short decay gives a plucky, staccato lead that leaves space between notes, which suits busy, rhythmic riffs. A fast attack with a long sustain gives a singing, held lead that can carry a slow melody. Neither is right or wrong, but it is a real decision, so match it to the part: short and sharp for a rhythmic hook, long and held for an expressive line.
A lead cuts through when it has its own space and a little edge, not simply when you turn it up. Give it a home in the frequency range where little else is competing, keep it bright enough to be heard, add a touch of saturation for presence, and use effects to place it without burying it. Reaching for the volume alone tends to just make the whole mix louder and no clearer.
Two bright sounds fighting in the same range mask each other, and a lead often clashes with pads, guitars or a busy synth part. Carve a little space for the lead with EQ, or arrange the other parts so they leave its register clear. A lead that owns its band is audible at a lower level than one shouting over everything, and it usually sounds cleaner for it.
Saturation and light distortion add harmonics and a bit of grit, which help a lead read as forward and present, and help it survive on small speakers that cannot reproduce much low end. Gentle is usually enough: a little warms the tone and pushes it forward, while too much simply turns it into a distorted lead, which is a fine style choice but a different sound. Add it slowly and stop when the lead sits where you want it.
Reverb and delay put a lead in a space and add depth, but too much pushes it far back and blurs the melody, so they are usually lighter on a lead than on a pad. A short delay can thicken and widen a line; chorus adds shimmer and a sense of width. The rule of thumb is enough to place the sound, not so much that the notes smear into each other and the tune gets lost.
Play the lead against the full mix, not soloed. Can you follow the melody easily without it being the loudest thing in the room? If it disappears the moment the other parts come in, the fix is usually its own frequency space or a touch more brightness and saturation, not more volume. Then check it on a phone or a laptop speaker: if the line still reads there, the lead is genuinely cutting rather than just sitting loud on big monitors.
Most single-line leads are monophonic, one note at a time, which keeps the melody focused and lets you use glide. Switch to polyphonic when the lead needs to play chords or stacked intervals such as octaves. Glide, also called portamento, slides the pitch from one note to the next instead of jumping straight to it, and it sounds cleanest on a mono lead, where it gives that expressive, almost vocal, sliding feel.
A mono synth plays one note at a time, which is ideal for a lead that plays a single melodic line: there is never any question about which note is sounding, and the sound stays tight and focused. Set it to poly when you want the lead to play chords, octaves or harmonies together. Many lead patches are mono by default for exactly this reason, and it is worth checking which mode a patch is in before you decide it will not play a chord.
Glide, or portamento, makes the pitch slide smoothly from one note to the next rather than stepping cleanly. A short glide adds a subtle lift between notes; a long glide gives an obvious, swooping slide that is almost like a voice bending into pitch. It is at its most musical on a mono lead played legato, where each note flows into the next. On many synths glide only takes effect when notes overlap, so play the line legato, with each note held into the following one, to hear it work.
Everything above is about the lead sound: the oscillator, the unison, the filter, the envelope, the grit and the effects. That is the half you have just built. The other half is the actual line, the notes and the rhythm, and it is a separate job you do not have to do by hand.
REHEAT is a writing tool. It generates the lead line itself, melodic or acid, so once you have a lead sound you like you do not also have to labour over the notes. Pick a style and it writes a line that follows your chords, and you either drag that line out as MIDI or play it live through your own lead synth with the REHEAT MIDI DRIVER. Either way the sound design stays yours and the part is handled. It runs as an Audio Unit, a VST3 and an AAX.
That split is the point of this page. The patch you build here is the sound; REHEAT supplies the line to play through it, and the two stay separate, so you can change one without redoing the other.
Free to hear in the browser, no signup. Everything above still works by hand on any synth, which is rather the point of writing it down.
We write these when there is something worth writing down. One email when a new one lands or a new Tunary instrument ships. No newsletter, no schedule.
Tunary