Arturia KeyStep Pro User Manual (PDF)
Distorted Percussive Sounds, Dubstep/Drum & Bass Basslines, and Haunting Atmospheric Pads in Eurorack
As a dedicated Eurorack modular musician, modulating your synth voices is essential for injecting movement, character, and energy into your performances. The Arturia KeyStep Pro is a powerhouse for generating complex, performance-worthy modulation and sequencing. Here's how you can push your modular system into creative and extreme sonic territories with its advanced capabilities.
Key Techniques: - Drum Gate Sequencing: Use Track 1 in Drum Mode to sequence up to 8 gate outputs for triggering percussion modules, drum voice modules, or triggering LPGs and VCAs with envelopes. - Gate Time Randomization: Use the Randomness encoder in Step Edit mode to randomize the likelihood of each hit, creating skipping, glitchy, unpredictable rhythms. - Accent Through Velocity: Map the Velo/Mod CV output to a distortion or waveshaper module's CV input, so strong strikes trigger harder distortion for punchy, aggressive results. - Advanced Polyrhythms/Polymeters: In Poly mode, set different track lengths for drum triggers. This causes the percussion to phase and shift, yielding wild evolving patterns. - Modulate Sound Source Parameters: Assign one of the main encoders to sequence CC# values mapped to filter cutoff, wavefolder gain, or drive parameters via MIDI→CV converters. This lets you automate gritty, resonant, or squelchy changes on every percussive trigger. - External Clock or Burst Modulation: Use the Clock In to inject burst generators or complex clocks (from modules like Pamela's NEW Workout, Temps Utile, etc.) for time-warped, juttered effects.
Patch Example: - Drum Gate Out 1 → Envelope → VCA controlling a metallic percussion sound. - Velo/Mod Out 1 → Intellijel Bifold or Bastl Timber (wavefolder drive). - Randomness: encoder up to 50-80% on key steps for glitch/skipping hits. - Use SHIFT+Time Division for rapid, spiky rhythms.
Key Techniques: - Multi-Track Bass Control: Split a heavy oscillator or voice (think: FM'd VCO into a lowpass filter with tons of resonance) between multiple tracks for layered basslines. - Sequence Steps with Overlapping Notes: Use Poly mode to stack notes in a step for aggressive "stacked osc" effects. - Modulate Filter/Fold/Drive: Route the extra Velo/Mod or CC# tracks to CV inputs on your filter or distortion/wavefolder modules. Automate cutoff sweeps, resonance, or distortion intensity step-by-step. - Envelope & LFO Groove: Arpeggiators on Track 2-4 running in triplets or odd time divisions allow you to send CV to modulate the same or companion bass parameters for tight, wobbly syncopation. - Pitch/Mod Touch-Strips: Live perform filter/pitch sweeps, sample-and-hold FX, or glide by assigning the pitch strip to modulate anything responsive to CV (like a PLL or MS-22 for twin filter chaos). - Randomness Encoder: Create "machine-gun" rolls, gate ratcheting (short triggered notes), or varying probability for live, jittering bass rhythms. - Transpose + Scale Mode: Play in a minor or Dorian scale, hitting Transpose as you perform for instant, key-corrected bass runs. - Slide/Glide Emulation: Use long gate steps, time-shifts, or chained tied steps with overlapping notes.
Patch Example: - Voice 1 Pitch Out → Complex VCO. - Gate Out 1 → Envelope (for Freq/Resonance modulation on filter). - Velo/Mod Out (set to aftertouch) → Filter CV input, automate grrrrrows. - Use the Step Edit's Time Shift encoder for off-grid grooves.
Key Techniques: - Polyphonic Step Entry: Enter lush, extended chords in poly mode on any sequencer track, then extend sequence length for slow-moving pads. - Rnd/Walk Sequence Directions: Use SHIFT+Seq Pattern to evolve/obscure progression order; create generative unexpected pad evolutions. - Scale Quantization: Engage Dorian, Mixolydian, or custom scales for modal, emotionally complex pads. - Modulate Pad Texture: Use secondary tracks not as pitch CV, but as CC# modulation or Velo/Mod outputs patched to shimmer reverb/delay modules, warping filters, pseudo-random LFOs, granular engines. - Ribbon Looper: Use the horizontal looper strip to spontaneously loop/hold chord snippets. In Control Mode, this can even send MIDI CCs to sweep through clouds or feedback. - Slow, Independent Division: Let one track run an ambient pad with 64 steps, while another triggers subtle filter/ringmod modulation in a different time division. - Overdub/Advanced Step Edit: Stack held notes, shift select notes in a chord, gently detune with the Pitch encoder, or offset their gates for evolving movement. - Ambient Percussion From Drum Sequencer: Use the Drum Gates to gently "strike" LPGs patched with slow decay envelopes for shimmering, bell-like, or decayed gongs in the periphery.
Patch Example: - Voice 1 Pitch/Velocity/Gate to stereo ambient voice (Rings/Clouds, ZDSP, Magneto). - Voice 2/3/4 to additional voices or effects, with the CC track modulating reverb or delay time/freeze. - Use the Step Edit feature to time-shift and randomize individual notes in the chord per step. - SHIFT+Hold on arpeggiators for evolving, generative pad movement.
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