The basics of synthesis
The basics of synthesis
As a music producer, developing your own unique sound is an essential skill. Synthesizers give you the freedom to design sounds that perfectly fit your music. But where do you start? In this blog post, we explain the fundamental principles step by step.
The four basic waveforms
Every complex synth sound starts with a simple waveform. Here are the four most important ones to recognize and use:
Sine
A soft, pure tone without additional harmonics. Ideal for sub-bass and kicks.
Triangle
Fuller than a sine wave due to added harmonics, but still subtle.
Square
Bright and full, with many higher harmonics. Perfect for powerful, character-rich sounds.
Sawtooth
The richest in harmonics, ideal for bright and energetic sounds.
Learn how these waveforms sound and how to recognize them, so you can easily choose the right starting point.
ADSR
The ADSR envelope determines how your sound evolves over time.
Attack
How quickly the sound reaches its peak.
Decay
How quickly the volume drops after the peak.
Sustain
The level that remains while the key is held.
Release
How quickly the sound fades after you release the key.
Experiment with these parameters to design sounds that match the energy of your track. From sharp, staccato hits to slow, atmospheric pads.
Filters and LFO's
Filters and LFOs
Filters are essential for shaping your sound. They remove specific frequencies from your signal.
Low-pass filter
Allows low frequencies to pass and cuts the highs.
High-pass filter
Allows high frequencies to pass and cuts the lows.
Special filters
Such as comb and phaser filters for creative effects.
LFOs, short for Low Frequency Oscillators, add movement to your sound. They can automatically modulate parameters such as filter frequency, volume, or pitch. This makes your sound more dynamic and interesting without constant manual adjustments.
Unison (Detuning) and Effects
With unison, you can layer multiple voices of the same waveform. By slightly detuning these voices and placing them in the stereo field, you create a wide and full sound. Be careful. Too much detuning can result in a messy mix.
Effects such as distortion, chorus, delay, and reverb can transform simple sounds into rich and dynamic textures. Effects add depth and character to your sound. Make sure your base sound is already strong, so effects enhance rather than compensate.
Distortion
For rough and powerful sounds.
Chorus
For a wider and fuller sound.
Delay and reverb
Add space and atmosphere.
Synthesis models
Here are some common synthesis methods.
- Additive synthese
Additive synthesis is based on the idea that any sound can be built by stacking simple sine waves at different frequencies and amplitudes. By carefully controlling the intensity and balance of these harmonics, you can create highly detailed and custom sounds. A well-known example is the Hammond organ, where the player can shape the harmonic content.
- Subtractive synthese
Subtractive synthesis starts with a harmonically rich waveform, such as a sawtooth or square wave, and removes parts of the frequency spectrum using filters. Filters like low-pass, high-pass, and band-pass reduce or eliminate specific frequency ranges. This allows you to shape and refine the sound in an intuitive way. It is one of the most commonly used synthesis methods.
- FM synthesis
FM synthesis generates sound by rapidly modulating the frequency of a carrier wave with another waveform called a modulator. This interaction creates new frequencies known as sidebands, resulting in complex harmonic structures. The modulation index determines how intense and rich the sound becomes. FM synthesis is known for its sharp and metallic textures.
- Wavetable synthesis
Wavetable synthesis uses pre-recorded waveforms stored in tables that can be scanned or modulated during playback. This allows sounds to evolve over time. Modulation sources such as LFOs or envelopes can move through different parts of the wavetable, creating complex and dynamic timbres. This method is very popular in electronic music.
- Granular synthesis
Granular synthesis breaks sound into small fragments called grains, usually between 1 and 100 milliseconds long. These grains can be manipulated in pitch, duration, amplitude, and order, and then layered or rearranged. This allows you to create entirely new textures, from subtle atmospheres to extreme glitch-like effects. It is often used in experimental sound design and film scoring.
Three tips from a pro
- Tip 1. Start simple and build up
When designing a new sound, start with a simple waveform such as a sine or sawtooth. Then gradually add elements like filters and LFOs. Add effects at the end. This helps you understand each component of the sound and prevents you from getting lost in complexity.
- Tip 2. Subtle variations
Unison and detune are great tools to make a sound wider and fuller, but subtlety is key. Try a small detune of 1 to 5 cents to enrich your sound without making it messy. Combine this with slight stereo panning for a more immersive result.
- Tip 3. Automation
Automation using LFOs or ADSR envelopes can bring your sound to life. Experiment with modulating filters, panning, or effects using different LFO speeds and shapes. This adds movement and texture even to simple sounds. Combine multiple LFOs for more complexity.
