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Cello Colors

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Why Cello Colors?

Features

A few things to keep in mind about the public beta server

Version History

v0.2.5 - 2026/05/15

  • App / Feature: Minor visual and UI enhancements.
  • App / Bugfix: Python 3.14 compatibility fix.
  • Editor / Bugfix: Reset position time to zero if navigating from the player screen with a negative time.
  • Editor / Bugfix: Show notes that start before and end after the current page.
  • Editor / Bugfix: Reset new note length to its default value when launching the editor.
  • Editor / Feature: Audio volume control.
  • Tuner / Feature: Improved tuner that uses the device microphone to help users tune their instrument.
  • Player / Feature: Pitch guide to help players stay on key (audibly plays the correct pitch in real time).

v0.2.4 - 2026/04/21

  • App / Feature: Minor visual and UI enhancements.
  • App / Feature: Multilingual support for the landing page.
  • App / Feature: Expanded range to three full scales (36 notes).
  • Save / Feature: Offline practice mode with PDF (score) and MP4 (audio) export.

v0.2.3 - 2026/03/29

  • Player / Bugfix: Fixed audio playing before score images are fully loaded.
  • Player / Bugfix: Effect selector is now disabled until audio effects are ready.
  • Player / Bugfix: Playback position is now preserved after selecting an effect.

v0.2.2 - 2026/02/20

  • Editor / Bugfix: Fixed loss of background images when replacing project audio.
  • Editor / Feature: Minor UX refinements.
  • Home / Feature: Optimized UI for small screens.
  • Load / Feature: Introduced built-in project repository (tutorials and demos).
  • Load / Feature: Added a progress-tracking loading screen with status and error reporting.
  • Player / Bugfix: Fixed "no sound" issue when starting a new project after completion.
  • Player / Bugfix: Corrected sharp '#' symbol rendering across all nomenclatures.
  • Player / Bugfix: Fixed score positioning and scaling issues on landscape mobile screens.
  • Player / Feature: Added 'None' nomenclature option.
  • Save / Bugfix: Replacing a project slot in "My Projects" now correctly refreshes the list.
  • Save / Feature: Increased cloud storage capacity from 20 to 50 slots.

v0.2.1 - 2026/01/18

  • App / Feature: Integrated tuner screen.
  • Editor / Bugfix: Disabled native browser context menu on mobile (long-press gesture).
  • Editor / Bugfix: Optimized asset loading to reduce initial note playback latency.
  • Editor / Bugfix: Fixed piano sound failures during score editing on Android devices.
  • Editor / Bugfix: Corrected play/pause button state upon audio completion.
  • Editor / Bugfix: Browser "Back" button now correctly triggers audio stop.
  • Editor / Feature: Enhanced UX for note manipulation (resize, move, delete) and time markers. Added zoom functionality.
  • Load / Feature: Improved mobile responsiveness for small screens.
  • Player / Bugfix: Fixed intermittent score image cutoff before the final note.
  • Player / Bugfix: Corrected seek time display when playback speed is not 100%.
  • Player / Bugfix: Resolved "black screen" issue on large scores (WebGL texture limit).
  • Player / Bugfix: Restored stereo signal for processed audio.
  • Player / Bugfix: Browser "Back" button now correctly triggers audio stop.
  • Player / Feature: Improved mobile responsiveness for small screens.
  • Player / Feature: Higher contrast visuals.
  • Player / Feature: Project description preview.

v0.1.12 - 2025/12/21

  • App / Feature: Player and Save screens are now disabled for empty scores.
  • App / Feature: Updated default app title and icon.
  • App / Feature: Added timeout countdown for project and audio uploads.
  • App / Feature: Full orientation support for PWA (Progressive Web App).
  • Editor / Bugfix: Prevented notes from being moved to negative positions.
  • Load / Feature: Cloud save slots (My Projects).
  • Player / Feature: Added audio enhacements and effects selector.
  • Player / Feature: Added loop option.
  • Player / Feature: Added an 8-second lead-in to allow preparation before playback.
  • Player / Feature: Added score nomenclature selector.
  • Player / Feature: Added "Start from beginning" option.
  • Player / Feature: Integrated score nomenclature selector and UI gesture helpers (zoom/seek).
  • Save / Bugfix: Fixed Android file extension issue; projects are now served as .zip files.
  • Save / Bugfix: Fixed project download errors caused by asynchronous score uploads.
  • Save / Feature: My projects (cloud save slots).
  • Server / Feature: Launched pre-production environment (pre.cellocolors.com).
  • Server / Feature: Optimized server-side project storage.

v0.1.11 - 2025/11/23

  • First public alpha release.