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Interface Overview

PERF’s interface is organized around four parameter cards surrounding a central radial visualizer, with a status bar along the bottom. 
┌─────────────────────────────────────────────────────────────────────┐
│  [MIDI Activity]                    PERF                            │
├──────────────┬──────────────────────────────┬───────────────────────┤
│              │                              │                       │
│   RHYTHM     │                              │   EXPRESSION          │
│   ENGINE     │                              │   CONTROLLER          │
│              │     CENTRAL VISUALIZATION    │                       │
│──────────────│                              │───────────────────────│
│              │     (Radial Perforation)     │                       │
│ PERFORATION  │                              │  PITCH LOGIC          │
│   ENGINE     │                              │                       │
│              │                              │                       │
├──────────────┴──────────────────────────────┴───────────────────────┤
│  Layers: 8/12  |  Events: 234  |  State: 1/4  |  [Export]          │
└─────────────────────────────────────────────────────────────────────┘

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The Four Cards

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Left Column

  • Rhythm Engine (top left) — Controls when notes occur. Select from 12 rhythm generation techniques and adjust density, note length, compression, and swing.
  • Perforation Engine (bottom left) — Controls which notes are removed. Select from 7 mathematical filtering strategies and adjust perforation amount, rotation, and layer interaction mode.

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Right Column

  • Expression Controller (top right) — Controls how notes are articulated. Velocity range, articulation style, CC controllers, micro-timing, and phrase structure.
  • Pitch Logic (bottom right) — Controls what notes play. Scale selection from 112+ scales, root note, octave span, and 10 pitch selection algorithms.

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Central Visualization

The radial visualizer displays all 12 layers as concentric rings. Active notes appear as colored arcs; perforated (removed) notes appear as faint outlines. A rotating playhead sweeps through the circle, triggering notes as it passes. The visualization supports 8 color analysis modes — from greyscale to Scriabin’s synesthetic color mapping. See Visualization for details.

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Bottom Bar

  • Layer count — Active layers out of 12
  • Event count — Total MIDI events generated
  • State position — Current section in the state sequence
  • Generation toggle — Master on/off for MIDI generation
  • Export — Write generated MIDI to file