Music planning: does a tempo change update the timing?

Check beat-to-second conversion with a fictional arrangement, separating arithmetic duration, audio tails and unheard quality.

Execution environment and usage

AI / software

Gemini

Where to operate

Ordinary text chat in the Gemini consumer web app at gemini.google.com. This card uses manually supplied text only.

Getting started

  1. Prefer an adult personal Google account and check regional/account eligibility first. Do not buy a plan for this exercise.
  2. Paste the fictional fixture into ordinary chat, or substitute authorized de-identified short text. Connect no external services.
  3. Compare output with the human acceptance checks. Preserve errors, gaps and unknowns for review.

Setup and plan requirements

Official web documentation checked 2026-11-11 lists Hong Kong, Macau and Taiwan, plus Simplified, Traditional and Hong Kong Chinese and English. An adult personal account is our recommended exercise scope, not a claim that all child, school or work accounts qualify. Personal/school accounts generally require 13 or the local applicable age; work accounts have separate 18+, administrator and plan conditions. Child/Family Link documentation contains inconsistent wording and needs separate verification.

Prompt portability limits

Start with standard free access; no subscription is required for this card. Taiwan advertises NT$0/month for free access. Local Hong Kong/Macau paid prices are unverified, so no local paid price is promised. Compute limits vary with model, complexity and conversation length, including five-hour and weekly caps; no fixed number of prompts is guaranteed. Wait if limited rather than assuming an upgrade is needed. Mobile, API, CLI and the original automation have separate eligibility, account and cost requirements.

Usage limitations

Documentation review is not a test from the three regions. Prompts, account access, model output and the original full workflow were not tested. Use fictional or de-identified data, never confidential inputs; some data can receive human review. Disabling activity is not zero retention: relevant chats can remain for 72 hours and undergo safety review. A person must verify outputs; text advice is not execution.

Environment sources

適用情境 / When to use

Check beat-to-second conversion with a fictional arrangement, separating arithmetic duration, audio tails and unheard quality. Adds beat-count invariance and timing recalculation after a tempo change, catching stale timestamps. Fictional fixture, not a real usage record: Constant quarter-note tempo: 120 BPM, 4/4. Section A: 4 bars; B: 6 bars, consecutive with no overlap, rests or intro; 4 beats per bar. Variant: change tempo only to 90 BPM. No audio file or tail settings are supplied.

步驟 / Steps

  1. Preserve input conditions and existing labels and use the fictional fixture with the parameterized prompt in text chat.
  2. Human check: A = 16 beats; B = 24. At 120 BPM: A 0–8 s, B 8–20 s. At 90 BPM: A 0–10⅔ s, B 10⅔–26⅔ s. Total remains 40 beats. Exact file duration, clipping absence and musical quality remain unknown.
  3. If output fails a check, record the discrepancy and revise the request for human review. Never present an expected answer as observed model output.

提示詞 / Prompt

From [bars per section, beats per bar, BPM beat unit, tempo, overlap/rest rules], list beats and start/end seconds. Show formulas and precision; do not invent sections. Recalculate [tempo change] while retaining beat counts. Separate score duration, rendering tails and actual file length. Produce planning text only; claim no audio generation, listening or measurement.

Fictional fixture, not a real usage record: Constant quarter-note tempo: 120 BPM, 4/4. Section A: 4 bars; B: 6 bars, consecutive with no overlap, rests or intro; 4 beats per bar. Variant: change tempo only to 90 BPM. No audio file or tail settings are supplied.

留意事項 / Cautions

  • Platform and region: ordinary Gemini web text chat. Official lists include Hong Kong, Macau, Taiwan, Chinese variants and English. Documentation checked 2026-11-11; local connections were not tested.
  • Plan and account: prefer an adult personal account. Standard free access is a starting point, with variable usage caps and no required subscription. Taiwan advertises NT$0/month free access; Hong Kong/Macau paid prices are unverified. No particular model or prompt count is guaranteed. Work, school and child accounts need separate checks.
  • No original toolchain is connected. Web availability does not establish mobile, API, CLI or original-automation access. Never supply confidential data. Activity-off chats can still remain for 72 hours and receive safety review.
  • Use original fictional beat plans, not unlicensed recordings; this exercise synthesizes no audio.

來源限制 / Evidence limits

The author shows code-generated music with Claude Code and also reports vocal and sampling failures. We neither listen to, synthesize nor measure audio or reproduce that code workflow. Correct arithmetic does not establish musical quality. Source published: 2026-02-04; checked: 2026-11-11. The original source provides inspiration, not validation of this exercise. Its toolchain, regional services and plans have not been reproduced. This card uses only the documented Gemini web text environment.

流程說明 / Workflow note

Original editorial adaptation, not a newly discovered use case or the source author’s verbatim workflow. Source-reported outcomes do not guarantee this exercise. Prompts were not tested. Adapted from this existing case: https://hkfrees.com/ai/case/reported-code-audio-arrangement/?lang=en Adds beat-count invariance and timing recalculation after a tempo change, catching stale timestamps. Open this card’s title for the official environment-source links and human acceptance steps on its full case page.

原始工具組合 / Original tool stack

Claude Code; Python; macOS say

Source publication date: 2026-02-04

Source checked: 2026-11-11

Claude composer