adminandClaude Opus 5.5 790e483198 Pitch a sound FX without changing its length #312 #313 #314 ...

The Pitch node changed the playback speed, so a sound pitched up was
also shorter and one pitched down longer. A pitch now keeps the
length, takes fractions and reaches further. Gain and the EQ bands
reach further down, and the EQ is renamed so a parametric one can
come later without a mix-up.

- Pitch shifting is the pure function pitchShift in
  core/soundfx/pitchShift.ts. It reads the sound faster or slower and
  stretches it back by WSOLA: 40 ms frames under a Hann window, each
  moved within 12.5 ms to where it continues the frame before it.
  A looping sound reads on across its end.
- SoundLibrary plays a pitched copy of the decoded buffer instead of
  setting playbackRate. Copies are kept per file, pitch and loop, the
  last 32 of them.
- stats().last tells the duration of what was played, so a check can
  see that the length is kept.
- Pitch: -64 to +64 semitones, scrubbed in steps of 0.1 (#312).
- Gain: -120 to +24 dB (#313).
- EQ is now labelled "5-Band-EQ", its bands go -60 to +24 dB (#314).
  The node type stays SoundFxEq, so saved graphs load unchanged.

Findings:
- A plain granular shifter was tried first and missed the pitch: at
  +0.5 semitones it measured 438 Hz instead of 452.9 Hz, because every
  grain restarts at the phase of the original. WSOLA measures 452 Hz.
- Far ends: +64 semitones from 440 Hz lands above half the sample rate
  and folds back, -64 is below what a 40 ms frame can follow. Nobody
  has listened to either.
- Speed: 3 s of a 48 kHz channel take 47 ms at +3 and +64, 171 ms
  at -64 (measured in Node).

Tests:
- pitch-shift (new): 7 tests. A 440 Hz sine at +12, -12, +7, +0.5 and
  -30.5 semitones is within 2 % of the target and keeps its length.
  Level stays at most 1, a loop does not fade at its seam.
- sound-library: 10 tests (+1), soundfx 22, node-catalog 368.
- Counter-check: with the pitched copy switched off the new
  sound-library test fails.
- e2e 34 (melektaus-atx): ALL PASSED - 28 checks. Its octave-down
  voice is now also checked for the length of the sound.
- Typecheck, ESLint and Prettier clean. The gate did not run.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

2026-10-05 19:32:00 +02:00

..

active-camera.test.ts

Show the camera's picture in the game tab without playing

2026-09-09 16:27:04 +02:00

bound-pictures.test.ts

Keep a pixel frame worn through a shader alive while it is drawn

2026-10-04 00:30:00 +02:00

camera-pointer.test.ts

Let Mouse position and Is hovered see through any camera (#304)

2026-10-03 19:09:53 +02:00

camera-shader.test.ts

Lay a shader over a camera's whole picture (#299)

2026-10-03 16:03:09 +02:00

collider-color.test.ts

Tint a collider's area only while the collider itself is selected

2026-09-24 12:05:29 +02:00

file-library.test.ts

Load every picture of a project ahead so animated tiles don't flicker

2026-09-26 23:50:49 +02:00

fullscreen.test.ts

Show only the game view in fullscreen, in the editor and the link (#267)

2026-09-29 14:44:14 +02:00

generated-pictures.test.ts

Free a redrawn picture only once no shader names it (#293)

2026-10-02 13:03:37 +02:00

joint-links.test.ts

Let a joint glide on a rail and drive it with a motor (#154)

2026-10-03 10:09:45 +02:00

label-rows.test.ts

Keep scene view names readable on plates and in rows of their own

2026-09-25 08:05:39 +02:00

layer-z.test.ts

Each tilemap layer has its own Z: an offset added to the Z of the placed tilemap, like a child's Z to its parent, default 0 keeps the previous order (layers right after their map, in list order), a negative Z sorts a layer below the map, on a tie layers keep their list order and follow the hierarchy against other objects; editor scene and game use the same order through the new pure function drawSlots, a tilemap draws into one container per layer, and the tilemap panel gains a Z field for the selected layer with one undo step per change (#174)

2026-09-19 14:03:20 +02:00

nine-slice.test.ts

A border drawn in pixels is as wide as the texture says a pixel is, so a small sheet can frame a large sprite (#96)

2026-09-16 18:09:43 +02:00

pick.test.ts

Pick the target of an object variable in the Scene View (#276)

2026-09-30 06:31:41 +02:00

pixel-grid.test.ts

Let a pixel perfect camera draw on the game view's pixel grid

2026-10-04 13:30:31 +02:00

quad-padding.test.ts

Clean up duplicates and dead code, and fix the + menu check (#85)

2026-10-03 17:38:39 +02:00

render-layers.test.ts

Add a node that names the render layer of an object (#305)

2026-10-03 19:25:47 +02:00

set-z.test.ts

Let a graph read and change the z of an object

2026-10-03 20:08:35 +02:00

sort-by-y.test.ts

Let pixel art and vector art be nine-sliced and sorted (#308)

2026-10-03 19:53:51 +02:00

sort-with-parent.test.ts

Let a container sort its content with its parent (#243)

2026-09-27 12:12:40 +02:00

sound-library.test.ts

Pitch a sound FX without changing its length #312 #313 #314

2026-10-05 19:32:00 +02:00

symbol-layout.test.ts

Draw scene symbols as white panel icons that make room for each other

2026-09-23 20:07:47 +02:00

tilemap-fill.test.ts

Fill texture and tilemap collision only where it is being edited

2026-09-24 12:23:13 +02:00

view.test.ts

Add zoom steps and a larger start caption to the game link (#266)

2026-09-29 14:14:54 +02:00