[repeat98]

Draft: waits for the owner's listening test, the owner-approved update record and the compiled packages (below). Follows #1473, which was closed into #1502 and then left it, since a module release does not ride in a base pull request.

FM Synth 0.1.3-experimental: cheaper on tracks that don't use it. Module code as on origin/module/fm-synth-0.1.3 (cb52118); no base change, base stays 4e9a87ea.

• Change in behaviour: none intended; FM Synth's frame hook costs less on tracks that hold no FM Synth. Release notes: src/community/module-changelogs/synth.json, 0.1.3.
• Author: Tim Hastie's OK was given to the owner (owner, 13 November 2026); place and day not stated yet.
• Measured (owner's MKII, 13 November 2026, development twin 55ab6215 of main bd9b5b0, 14 other modules installed, FM Synth on no track; frame interrupt share playing / stopped after playing): no FM Synth 63.1 / 31.8 %; 0.1.2 76.6 / 43.6 %; 0.1.3 73.9 / 40.2 %. CPU meter playing 73-76, 84-88, 81-85 %. Renders skipped in 10 s: 0, about 12,200, about 230. Measured on the base before Improvement: one Octatrack base update: update and sync screens, CPU FULL guard, stall frames, engine price in the package, Windows USB, a larger RAM boot stage #1502; nothing is measured on 4e9a87ea.
• Not tested on hardware yet (TESTING.md says so): FM notes, a chord, glide with LEG; GLIDE on a FLEX and a STATIC sample track; a legacy FMSYNTH sample; a track changed from FM back to FLEX.
• In this pull request beyond the module: the five machine recipes recaptured on base 4e9a87ea (POLY8, Scale Quantizer, VECTOR and Analog BD change only the pin of machine-ports.json; FM Synth also its source, copies and image hash), and FM Synth's USB package row (30,166 bytes, SHA-256 e9ae3e5e…, reproduced by npm run octatrack:module-packages).
• npm run module:doctor -- synth, still red: modules:check ("owner-approved update does not cover this module version"), the compiled packages lack synth@0.1.3, and their fingerprint is of the 0.1.2 code. The evidence and media records still say 0.1.2 and "untested"; they are left as they are until the owner decides.
• What the guides lacked or got wrong: nothing

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