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Sounds and the sound editor

Every sprite and the stage can hold sounds: audio clips you play with Sound blocks. The Sounds tab lists them and opens the built-in sound editor, where you can record, trim, and apply effects without leaving Bilup.

The sound list​

Sounds appear down the left of the Sounds tab, each with a name and its length in seconds. Click one to select and edit it. Right-click for duplicate, export (saves the clip to your computer), and delete.

Adding a sound​

The round add button at the bottom offers:

  • Choose a Sound: pick from the built-in library.
  • Upload Sound: load an audio file. Accepted types are .wav, .mp3, .ogg, .flac, .aac, and .m4a. You can select several at once.
  • Surprise: add a random sound from the library.
  • Record: capture audio from your microphone (see below).

Recording​

Record opens the recorder. Grant microphone access, press record, then stop when you are done. You get a waveform with trim handles so you can cut the recording down to just the part you want before saving it as a new sound. Recording needs a working microphone and browser audio support.

The sound editor​

Selecting a sound shows its waveform. The controls are:

  • Play / Stop (also toggled with the spacebar).
  • Drag across the waveform to make a selection. The time readout shows the position and length of the current selection, or of the whole sound if nothing is selected. Press Escape or Ctrl+A to clear or select all.
  • Trim: with a selection made, Delete (or the Delete / Backspace key) removes it. Shift+Delete keeps only the selection and deletes everything else.
  • Copy, Paste, and Copy to New (turns the selection into a brand-new sound). Standard Ctrl+C / Ctrl+V also work.
  • Undo and Redo (Ctrl+Z / Ctrl+Shift+Z), up to 99 steps.

Effects apply to the selection, or to the whole sound if nothing is selected:

  • Faster and Slower change the playback rate and pitch.
  • Louder and Softer change the volume (Louder is disabled when the clip is already near clipping).
  • Mute silences the selection.
  • Fade in and Fade out ramp the volume at the edges.
  • Reverse plays the audio backwards.
  • Robot adds a metallic, pitched texture.
  • Echo adds a repeating echo.

Notes​

  • The editor works in mono. Editing a stereo sound warns you first, because saving the edit converts it to mono permanently.
  • Below the waveform is the clip's sample rate, channel count, and file size. Very large sounds show a warning that they may be too big to upload.
  • Sound edits are destructive to the stored asset but fully undoable while the editor is open.

See also​