Interlacer
Interlacer is a composition engine treating arbitrary audio as recoverable musical primitives (stems, MIDI, chords, rhythm), re-performed across a different tradition or medium. Its first use case: the mashup as a staged, replayable pipeline.
Interlacer (registered as GSV-A11 in the GSV catalog) is a composition and production engine for musical and cultural collisions: it treats arbitrary audio as a set of recoverable primitives — stems, MIDI, chords, rhythm — and re-performs those primitives across a different musical tradition, medium, or texture. It is the named production mode for collisions inside GSV's Medium Setting channel, whose broader remit is media ecology and meaning-making across intelligences: take one source work, cross it against another tradition or image-world, and render the result as an audio or video artifact. Its first concrete use case reframes the mashup as a timbral transplant rather than a simple overlay of two tracks. The engine is built as a pipeline of separable stages rather than a monolith. An `extractors/` module pulls primitives out of source media via stem separation and ingest from sources like YouTube; `operations.py` and `primitives.py` hold the collision and transformation logic; `analyze.py` scores compatibility between sources; and `renderers.py` produce final output, drawing on generative audio (Suno) and sample libraries. Supporting API adapters — lastfm, musicbrainz, spotify, archive_org, lalalai — supply metadata and separation services, and an `auditron/` module is reserved for audit and evaluation tooling. A canonical `interlacer` CLI drives the whole system, with `mashup-matcher` kept as a compatibility command inherited from the prototype Interlacer grew out of. The documented workflow is deliberately staged and replayable: capture an idea, map its sources and constraints, score structural compatibility, then render. Within the GSV portfolio, Interlacer sits inside the mediumsetting monorepo alongside Ong-Lots and ong-back, as the media-ecology / meaning-across-sapiences arm of that project. As of the available grounding, mediumsetting is in-flight: it has a vision doc, PRD, and phased roadmap, and the interlacer production pipeline is scaffolded with tests, but full production use is not yet established.