Predictor

Predictor is a generative MIDI composition tool from Sampleson that learns from uploaded MIDI files to predict and generate subsequent notes and voicings. The engine analyzes harmonic progressions, voice leading, velocity curves, piece position, modulations, and tonal relationships within a source file, then uses this analysis to suggest musically coherent continuations. Rather than functioning as a fully autonomous sequencer, Predictor positions the user as an active participant: you control timing and rhythm while the plugin generates pitch content, triggered by mouse clicks, keyboard input, or MIDI controller data.

The technical approach emphasizes melodic and harmonic prediction across three keyboard zones - low (below F2), mid (F2 to F4), and high (F4 and above) - which contextually inform the range of generated notes. This zoning system prevents awkward octave jumps and maintains musical coherence relative to your input range. The plugin ships with an integrated MIDI library covering multiple genres, though its real strength emerges when trained on your own material: film scores, jazz standards, orchestral arrangements, or proprietary chord vocabularies.

Predictor serves composers facing ideation bottlenecks and electronic musicians seeking constrained randomness within compositional workflows. It's less useful as a replacement for deliberate harmonic planning and more valuable as an exploratory tool that generates viable alternatives worth auditing. Among prediction-based composition plugins, it prioritizes user agency and rhythmic control over hands-off generation. The results range from immediately usable to genuinely surprising, reflecting the quality and stylistic consistency of your training data.