SPACEDRIFT v1.6.2 is a generative MIDI ambient engine built for creative harmonic exploration. It works by combining algorithmic progression logic with dynamic musical scale switching to generate shifting, evolving textures on a single MIDI channel.
Here is a breakdown of how the engine functions under the hood:
1. The Harmonic Matrix (Markov Chain)
Instead of moving randomly or following a static chord loop, the module uses a probability-based Markov chain to navigate between five distinct harmonic states (I, IV, V, vi, and \flat\text{VI}). This creates an unpredictable yet musically coherent progression that naturally shifts tension and resolution.
2. Dual-Axis Scale Pivoting
The defining feature of this script is its ability to dynamically rewrite its underlying scale matrix. When the engine drifts into the \flat\text{VI} Space Axis, it automatically pivots the global ecosystem from a Major scale to a Minor scale. This layout shift ensures that the striking, cinematic flavor of the chromatic mediant is perfectly quantized and voice-led without manual user intervention.
3. Voice Allocation & Inversion Tracking
The script maps out a four-note vector stack:
• Voice 0: A solid bass anchor root note.
• Voice 1: A perfect fifth stack for structural density (85% probability).
• Voice 2: An octave tracking voice (70% probability).
• Voice 3: A high color extension/third (55% probability).
To keep the performance balanced, an Inversion Cap constraint monitors the high-end extension notes. If they drift too high into piercing frequencies, the engine automatically folds the upper intervals down an octave to maintain smooth, continuous voice-leading.
4. Generative Rhythmic Subdivision & Drift
The script acts as its own internal clock modulator. Driven by incoming host synchronization pulses, it randomly selects and alternates between shifting rhythmic sub-divisions (8, 12, 16, or 24 PPQN pulses). Simultaneously, an internal LFO modulates key velocities to create an organic, shimmering “human pulse” effect while humanized micro-delays add unique time-drift spacing to each chord trigger.