How to create hypnotic arpeggios for psytrance

An arpeggio is a chord played one note at a time in quick succession. In psytrance, repeating arpeggio lines are one of the main tools for the hypnotic effect the genre is known for: they keep moving while the kick and bass hold the groove, and small changes in them can carry a track for minutes. Here is how to write, design and arrange them.

Writing the pattern

Start with the scale or mode of your track. Minor, major, diminished or whole-tone scales each give a different flavour, and the chords underneath set the mood the arpeggio moves through.

Keep the first version simple, for example a three-note sequence, and build complexity step by step with more notes or rhythmic variations. Simple patterns are often the most hypnotic, because the listener can lock onto them. Then play with the rhythm:

• Vary note lengths and subdivisions so the line breathes against the beat.
• Use syncopation, triplets or dotted rhythms to make certain notes stand out from the steady flow.
• Try patterns of a different length than the bar, such as a three-step line over a four-beat groove. The accents shift on every repeat, which creates a rolling, constantly changing feel.
• Nudge notes slightly behind the grid for a more laid-back feel against the driving pulse.

Choosing the sound

Classic waveforms like saw, square and pulse are the usual starting point; analog synths and their emulations give a warm, rich tone. FM synthesis produces bright, complex sounds that cut through the mix, and wavetable synths such as Serum and Massive let you move through different waveforms and offer deep modulation options.

Movement comes from modulation. An LFO on the filter cutoff creates a pulsing effect that adds to the rhythm, and slowly opening the cutoff over a long phrase makes the line feel alive. Automating filter resonance, pitch or synth macros has a similar effect. Match the timbre to the mood: bright and cutting, deep and subby, or dreamy.

Layering and effects

Layering gives an arpeggio depth. Double the line an octave lower to give it a foundation, or add a harmonised version a third or fifth above. Pairing a bright, sharp sound with a warm pad underneath fills out the spectrum.

Effects do the rest:

• Chorus and phaser widen the stereo image and thicken the sound. Adjust depth and rate so they add motion without blurring the notes.
• Reverb places the line in a space. Pre-delay and decay time decide how it sits in the mix: subtle for clarity, larger for a floating feel above the rhythm.
• Delay adds rhythm. Tape delay sounds warmer, ping-pong delay bounces between left and right. Sync it to the tempo; short delays tighten the groove, longer ones make the line more hypnotic.

Automate filter cutoff, reverb mix and delay feedback over the track so the line keeps evolving instead of looping statically.

Arranging arpeggios in the track

Decide what role the arpeggio plays in each section. In the intro it can be an atmospheric element, quiet and filtered. In the build-up you can bring in extra arpeggio layers one after another, with filter sweeps and volume swells marking the transitions. At the peak the arpeggio can take centre stage and drive the energy. Pulling the effects back right before a transition makes their return hit harder.

Keep the balance in mind. The kick and bass stay the foundation, so give the arpeggio its own frequency range with EQ: high lines cut through, lower ones add warmth, but neither should compete with the bass. A secondary line that complements or contrasts with the main rhythm can add interest, and arpeggios that weave around a lead melody in counterpoint support both without either getting buried.

Above all, let the changes happen slowly. The hypnotic effect comes from repetition with small variations, not from constant new ideas.