4-Oscillator Synth with Independent Shaping and Dual Hard Sync
Marco Synth
4-Oscillator Synth with Independent Shaping and Dual Hard Sync
Marco asks a different question. Not "what synth should we clone?" — but "what workflow becomes possible when we don't?"
The answer was Marco: four fully independent oscillators — each with its own waveform, filter, envelopes and modulation — running two parallel hard-sync groups instead of one. Sounds no other iOS synth hands you out of the box — glassy harmonics, aggressive overtones, sweeping timbres, one tap away. And a workflow anyone can play: a musical random generator and a Tweak system that's part of the writing. Hit the dice. Tweak it. Save it. Or dive deeper when you're ready. Whether it's your first synth or your fortieth, Marco meets you where you are.
A Dual Hard Sync button cycles through every valid dual hard sync configuration. Pair it with the Generate dice and Marco can't help but sing — territory you simply haven't heard before on iOS.
Assign any oscillator to group A, group B, or leave it free — two parallel hard-sync groups where every other synth gives you one. No patching, no modular rig to build — just an instrument you play.
One tap of the Dual Hard Sync button steps through every valid dual hard sync configuration — the fastest way to hear what your sound can become. New territory in seconds.
Stack it with the dice and the musical random generator for instantly unfamiliar, never-heard-before sounds.
Among 100+ presets, ten Signature sounds are built around Dual Hard Sync to show exactly what it can do.
This isn't layering. This isn't "multi-oscillator" in the usual sense. Marco gives you four fully independent sound engines — each with its own waveform, filter, envelopes and modulation — ready to play out of the box, not a modular patch you have to build.
Its own waveform, filter, envelopes, LFOs, effects.
Run a saw through a notch while Osc 1 holds a sine.
Add a slow wavefold LFO without touching the others.
Detune, glide, and modulate completely on its own.
Visual feedback with per-oscillator scopes — see exactly what each engine is doing.
Random and Tweak aren't gimmicks bolted onto a synth. They're part of the writing — a workflow only digital can offer, designed to keep you moving from one idea to the next.
Most randomisers create chaos. Marco creates ideas — musical, targeted, controllable.
Go from "that's interesting" to "that's the sound" in seconds.
“The scope thing is pretty cool. The randomizer though is something to behold.”
“This is one of those apps that produces some really fantastic sounds using the random preset generator.”
The Master tab is where every layer is glued into a single, polished sound. A full studio bus chain — drive, compression, delay, reverb, stereo width and a true-peak limiter — sits across the output, so the patch you hear is the patch you ship. No reaching for external AUv3 effects, no plugin chain to assemble: everything you need to shape, sweeten and master the sound is built right in.
Marco ships with 20 Master presets out of the box — ready-made mastering chains for a range of styles — and you can save your own to reuse across any patch.
Soft, hard, tube or wavefold saturation with tone and mix — warmth, grit or full aggression.
Threshold, ratio, attack and release with auto-gain — tighten the dynamics and add punch.
Tempo-syncable echo with feedback, wow and mix — depth, space and movement.
Dark, warm, clear or bright spaces with decay, size and pre-delay control.
Width and drift with a bass-mono safe mode — widen the image without losing the low end.
Ceiling and release — a transparent brickwall to finish at a full, consistent level.
The standalone iPad and iPhone apps include a built-in music player featuring public domain tracks — designed for quick experimentation and sound auditioning. MIDI input is also supported, so you can drive Marco from any controller or sequencer.
Load a preset, hit play, and hear how it sits in real music — without setting up a Host.
Great for kids and parties too — hear Happy Birthday, Twinkle Twinkle or Für Elise reimagined through evolving synth sounds at the tap of a button.
The full feature set, at a glance — everything Marco gives you to sketch an idea and finish a track.
Marco starts with the workflow. The sound follows.
Dual Hard Sync. Full per-oscillator control. A random generator that produces ideas, not noise. A tweak system that's part of the writing, not a starting point. Workflow designed for digital — and sound nobody else can give you.
Create sounds no one else can.
Available on the Apple App Store for iPhone, iPad, and Mac.