feat(dsl,pattern,cli): Phase 9 — Arp, humanize, drift, keepFor#21
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- pattern: humanize(amount, pattern) — deterministic velocity variation - dsl: Arp() instrument — arpeggiator factory with up/down/pingpong/random modes - dsl: ArpDSLProps type — notes, mode, rate, wave, envelope, gain, effects - dsl: drift(center, sigma, theta) — OU-process note pitch wandering - dsl: keepFor(bars, pattern) — freeze pattern evaluation for N bars - cli/engine: wire 'arp' instrumentType into createScoreEngine step sequencer - tests: humanize (6), Arp (7), drift (6), keepFor (5) — 24 new tests, 1133 total Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Summary
humanize(amount, pattern)— deterministic velocity variation per step; same step+bar always produces the same jitter, so patterns stay consistent within a bar but vary across barsArp(props)— arpeggiatorInstrumentDescriptor; cycles through anotes[]array withup/down/pingpong/randommodes, wired into engine step sequencerdrift(center, sigma, theta)— OU-process note pitch wandering; all steps in the same bar share the same offset, mean-reverting toward centerkeepFor(bars, pattern)— freezes pattern bar-evaluation for N bars; useful in live coding to hold a random/varying pattern steady before it rerollsNo conflicts with PR #20
Only touches
@score/dsl,@score/pattern, andcli/engine.ts— does not modifypackages/cli/src/index.ts, so no conflict with theplaylistcommand in PR #20. Theindex.tsmerge conflict (repl + playlist) will be resolved at rebase time after #20 merges.Test plan
humanize— 6 tests: zero preservation, non-zero variation, amount=0 identity, determinism, variance, wrapArp— 7 tests: descriptor type, props storage, mode/wave/gain, unique ids, no-op lifecycle, envelopedrift— 6 tests: returns function, returns valid note string, sigma=0 identity, same bar same value, varies across bars, independent instanceskeepFor— 5 tests: freezes within block, advances after N bars, array patterns, step wrapping, bars=1🤖 Generated with Claude Code