Initial TrueGrowth source import

openspec/changes/archive/2026-04-29-update-audio-playback-speed-control/specs/canvas-audio-playback/spec.md

@@ -0,0 +1,28 @@
+## MODIFIED Requirements
+
+### Requirement: Shared playback modes for audio players
+The system SHALL provide shared playback controls for the global floating audio player and the music player tool.
+
+#### Scenario: Switch playback speed from the floating player
+- **GIVEN** an audio or reading queue is active
+- **WHEN** the user changes playback speed from the floating player dropdown
+- **THEN** the system SHALL update the shared playback speed state
+- **AND** the music player tool SHALL reflect the same selected speed
+
+#### Scenario: Switch playback speed from the music player tool
+- **GIVEN** an audio or reading queue is active
+- **WHEN** the user changes playback speed from the music player tool dropdown
+- **THEN** the system SHALL update the shared playback speed state
+- **AND** the floating player SHALL reflect the same selected speed
+
+#### Scenario: Sync reading speed with TTS settings
+- **GIVEN** the active queue is a reading queue
+- **WHEN** the user changes playback speed from either player entry
+- **THEN** the system SHALL update the current reading playback speed
+- **AND** SHALL sync the same value to `tts.rate`
+
+#### Scenario: Reflect external TTS speed changes during reading
+- **GIVEN** a reading queue is active
+- **WHEN** `tts.rate` changes from the settings panel
+- **THEN** the shared reading playback speed SHALL update
+- **AND** both player entries SHALL reflect the latest reading speed