e10d

 ___ _  ___  ___ _
/ _ ( )/ _ \|   ( )
\___/_|\___/|_|_/_/
  analog synth

a minimalist modular analog synthesizer for iPhone. built with AudioKit. no bloat.

---

what it is

e10d is a signal chain in your pocket.

six knobs. four waveforms. sixteen steps. one output.

VCO ──▶ VCF ──▶ ENV ──▶ OUT ──▶ ◈

the whole synth fits on one screen. no tabs, no menus, no patch cables to drag around. just sound.

---

the signal chain

module	params	what it does
VCO	TUNE, waveform	voltage-controlled oscillator — the sound source
VCF	CUT, RES	moog ladder filter — sculpt the tone
ENV	ATK, REL	amplitude envelope — shape the dynamics
OUT	VOL	master output fader

16-step sequencer at the bottom. tap steps to toggle. dial in BPM and root note. play fires the chain. stop freezes it.

---

knobs

[ TUNE ]  [ CUT ]  [ RES ]  [ ATK ]  [ REL ]  [ VOL ]

that's it. six knobs. turn them.

• TUNE — semitone offset ±24st from root note
• CUT — filter cutoff 20hz → 20khz
• RES — resonance 0 → 0.99 (careful up here)
• ATK — envelope attack 0s → 4s
• REL — envelope release 0s → 4s
• VOL — master output 0 → 1

---

waveforms

SINE   SAW   SQR   TRI
 ∿     /|    ⊓    /\

tap to switch. no crossfading. instant.

---

sequencer

[■][ ][■][ ][■][ ][ ][■]
[ ][■][ ][■][ ][■][■][ ]

▶  NOTE C4  BPM 120

• 16 steps, 2 rows of 8
• tap a step to toggle it on/off
• the glowing amber block = current position
• NOTE sets root pitch for all steps
• BPM 20–250 via +/−

---

stack

layer	tech
language	Swift 6
UI	SwiftUI
audio	AudioKit 5.6 + SoundpipeAudioKit
filter	Moog Ladder (SoundpipeAudioKit)
envelope	AmplitudeEnvelope (SoundpipeAudioKit)
MIDI	CoreMIDI via AudioKit
platform	iOS 17+
arch	MVVM + modular graph

---

build

requires Xcode 16+ and xcodegen.

git clone https://github.com/yourname/e10d-analog-synth
cd e10d-analog-synth
xcodegen generate
open e10dSynth.xcodeproj

select a simulator or device. hit run.

packages resolve automatically on first build (~60s).

---

midi

e10d listens on channel 1 by default. plug in a controller. play notes. the VCO tracks pitch, ENV fires on note-on, releases on note-off. MIDI clock sync: coming.

---

architecture

SynthEngine (singleton)
├── VCOModule   → DynamicOscillator
├── VCFModule   → MoogLadder
├── ENVModule   → AmplitudeEnvelope
└── OUTModule   → Fader
        │
        ▼
    AudioEngine.output

SequencerViewModel
├── SequencerClock (Timer-based, drift-corrected)
└── Pattern [tracks[0..7]] → [Step x16]
        │  on tick →
        ▼
    SynthEngine.noteOn(note:velocity:)

modules are protocol-typed (SynthModule), own an AudioKit Node, and can be connected arbitrarily via ModularGraph. the default chain is hardwired at launch; patch changes trigger rebuildAudioChain().

---

license

MIT. do what you want. make noise.

---

e10d ● running