QualiaAudio Lab

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DDP player

Check your CD master before it goes to the pressing plant. Open the DDP image we sent you, listen to it gapless, check the track order, pauses, transitions, CD-Text and ISRC codes, and approve the master. Your files never leave your computer.

Drop the DDP folder or ZIP file here

or

Files are read on your own computer. Nothing is uploaded.

How to use it

  1. Download the DDP we sent you. It can stay as a ZIP file, or you can unzip it to a folder.
  2. Drop the ZIP or the folder in the box above, or use the buttons to choose it.
  3. Listen to the whole disc and use ⇄ to check each transition between tracks.
  4. When you are happy, approve the master in the form below the player, or tell us what you would like changed.

What it checks

  • Integrity: every file is verified against the MD5 checksums in the DDP, so you know the master arrived complete and undamaged.
  • Track list and PQ: start times, lengths and pauses exactly as they will be on the CD, with a printable PQ sheet.
  • CD-Text, ISRC and UPC/EAN: titles, performers, composers and codes as they will be read by CD players and distributors.
  • Loudness: integrated loudness (LUFS), loudness range (LRA) and 4x oversampled true peak (dBTP) for every track and for the whole album, measured to EBU R 128 / ITU-R BS.1770-4.
  • Transitions: the end of each track straight into the start of the next, so you can judge gaps and crossfades.

Privacy

The player runs entirely in your browser. The DDP is read from your own disk and is never uploaded to us or anyone else. Only the approval form, if you send it, reaches us.

Compatibility

Works in current Chrome, Edge, Firefox and Safari on Windows, macOS and Linux. On phones and tablets, choose the ZIP file. A browser cannot burn CDs: for a reference disc, ask us or use a desktop DDP tool.

Need a CD master? See vinyl and CD mastering or get in touch.

DDP® is a trademark of DCA, Inc.