Sound Design

BKS Harmonic is a music-theory-aware additive synthesizer — a sound is a stack of partials you reshape directly. The whole layout at a glance, and how the modules fit together.

Sound as vibration, the harmonic series, why synthesis matters. How every synth — hardware or software — manipulates the same physics.

What sound is, how frequency and amplitude work, and why the harmonic series determines the timbre of every instrument — the physics behind EQ, synthesis, and mixing.

The heart of BKS Harmonic — the glowing pad where you set how many harmonics are open (vertical) and how the series folds across octaves (horizontal). Plus solo mode for hearing each partial.

Waveforms (sine, saw, square, triangle, noise), pitch, tuning, detuning. The raw material before anything else happens.

How EQ works: low-pass, high-pass, band-pass, shelf, and parametric filters explained — frequency, gain, Q, resonance, and the subtractive approach to shaping sound.

The three controls that make BKS Harmonic what it is. Fold pulls the harmonic series down through the octaves, Gin lets the sub-fundamental layers sound, and Tonic keeps them anchored to the root.

Low-pass, high-pass, band-pass, notch. Cutoff, resonance, filter slopes. Why the filter is the most expressive part of subtractive synthesis.

Where synthesized sound comes from — oscillator types, waveform shapes, and the harmonic recipe behind each one.

The scope is how you watch a sound being built. Oscilloscope, FFT, vibrating string, harmony, and a per-partial info readout — and why each view earns its place.

VCA, ADSR, how envelopes shape volume over time. Why attack and release define character more than the oscillator does.

ADSR envelopes explained: attack, decay, sustain, release — how filter and amplitude envelopes shape synthesizer sounds from plucks to pads.

Four controls for finer spectral shaping — Re-excite, Converge, Phase, and Clamp. Where the matrix sets the broad strokes, these reach in and rearrange the partials themselves.

LFOs, envelope followers, mod matrix. Vibrato, tremolo, filter sweeps. The principle: one signal controls another.

LFOs, vibrato, tremolo, detuning, unison, and glide — the tools that make static sounds come alive.

Sculpt is hands-on spectral drawing: per-partial level bars, a Morph slider that sweeps between classic waveshapes, and a Blend that crossfades the whole sound into resonant noise.

The classic architecture: oscillator, filter, amplifier. How subtractive synthesis works, why it dominated for decades, and how to build a complete subtractive voice in VCV Rack.

Subtractive, FM, wavetable, and granular synthesis compared — how to build patches from scratch, and what 'analog warmth' actually means in technical terms.

The overtone scan sweeps focus across the partials you've built — not adding new notes, but bringing the components already in the sound in and out of focus over time.

Carriers, modulators, ratios, algorithms. Why FM synthesis can produce sounds that subtractive cannot touch — metallic bells, glassy keys, evolving textures — all from sine waves.

A second envelope that shapes only a chosen group of partials — so part of the spectrum can swell in, click, or fade away on its own timeline, independent of the note's main volume.

Building sound from individual harmonics. The Fourier transform in plain language, drawbar organs, the Synclavier, and why additive gives you total spectral control at the cost of complexity.

The music-theory move: boost the partials whose pitch matches the chord or scale you're playing, so the timbre reinforces the harmony. Play in key and the sound follows.

How synthesizers work — from oscillators to algorithms. Platform-agnostic concepts you can apply to any synth, any DAW, any era of electronic music.

Morphing between snapshots of waveforms. Single-cycle waves, wavetable position, the PPG Wave, and modern wavetable engines like Vital — where the boundary between synthesis and sampling dissolves.

Where the synth's music-theory roots show: choose pure just intonation or equal temperament, stretch the partials into piano-like inharmonicity, and thicken with unison.

Samplers as synthesizers, single-cycle waveforms as oscillators, the Fairlight and S1000, MPC-style chopping, and where sampling ends and synthesis begins.

A guide to BKS Harmonic — the music-theory-aware harmonic synthesizer. Additive synthesis built around the harmonic series, the partials matrix, gin and tonic, the overtone scan, and the sculpt and resonant engines.

A second sound source under the partial engine — noise, a classic oscillator, or a detuned double of the whole matrix. With its own tuning and filter, it adds body, grit, or width.

Grains, windows, spray, density. Pierre Schaeffer and musique concrete. How granular turns any recording into a synthesizer.

The familiar cutoff-and-resonance filter, plus three twists tied to the rest of the synth — Scan tracking, keyboard follow, and a Pluck transient.

Simulating real instruments through math — exciters, resonators, waveguides. How a computer can model a plucked string without a single sample.

The main amplitude envelope — standard ADSR plus a Fade for piano-style decay and VCA/VCF amounts that decide how much the envelope shapes the volume and the filter.

Feedback, delay as pitch, ring modulation, vocoders. When effects stop processing and start generating.

The system that drives everything else. A second LFO and envelope, performance sources like velocity and the mod wheel, and a mod matrix that routes any of them to almost any control.

Audio rate vs control rate. CV, gates, triggers. How modular signal flow maps to any synth architecture.

The final stage — transpose, stereo width, drive, level, pan, and velocity sensitivity, plus mono-sum and auto-gain for keeping patches consistent.

Creative constraints for building synthesis skills — no-oscillator patches, one-voice drum machines, timed patch challenges. Constraints breed creativity.

The built-in finishing chain — EQ, delay, and reverb — color-coded so they read apart at a glance. Enough to make a patch sit in a mix without leaving the synth.

The everyday housekeeping — browsing and sharing patches, the PANIC and RAND buttons, and the Settings panel for glide, polyphony, pitch bend, and getting help.

What if you could hear everything? Sound waves are spheres with pressure in one dimension and time in the other.