Audio CDs:

Step 1

Name your .MP3 or .WAV files with a leading zero since we burn the files in alphabetical order.

Step 2

Create a .zip or .rar file if your .MP3 or .WAV files.

Before we burn the Audio CD, we unzip your .MP3 or .WAV files and use them to create a true Audio CD.

audio CD

Step 3

Upload the zip file directly to the TrepStar project. You may upload to your server or cloud service (like Amazon S3).

Step 1: Name your files with leading zeroes:

Please read this first. This contains very important information about the difference between audio CDs and data CDs.

If you have the WAV or MP3 files, it's time to create a folder on your computer for each CD you plan to make. Place the MP3 or WAV files in that folder.

Name your MP3 or WAV files in alphabetical order: We sort them that way when we burn them. Number your track file names, making sure to use leading zeroes. This will ensure we burn them in the order you want them played.

  1. 01track.MP3
  2. 02track.MP3
  3. ...
  4. 09track.MP3
  5. 10track.MP3
  6. ...
  7. 23track.MP3
  8. ...
  9. 55track.MP3

Alphabetically, 10track.mp3 will sort BEFORE 9track.mp3! This is why you should use leading zeroes (09trackname.MP3 sorts first before 10trackabc.MP3).

It does not matter what you name your files as long as you use leading numbers with leading zeroes. It's OK to give them meaningful names but it's not necessary.

  1. 01My first song.MP3
  2. ...
  3. 09Sounds of the Forest.MP3
  4. 10Music of the Meadow.MP3
  5. ...
  6. 63Dawn in the Desert.MP3

WAV file format:
It's important to know that audio CDs must have files in a certain format so audio CD players can play them. Your .WAV file needs to be saved as 16 bit 1411kbps or they can not be used:

Audio Sample Rate: 16bit
Channels: 2 (stereo)
Frequency: 44 khz (44100hz)
Bit Rate: 1411 kbps

MP3 file format:
It's important to know that our system accepts .MP3 files that have been extracted in the following format only:

Audio Sample Rate: 16bit
Channels: 1 or 2 (stereo or mono)
Frequency: 44 khz (44100hz)
Bit Rate: (you may choose). We recommend 192 kbps or higher so the quality is good.

Important notes about our audio CD process:
  1. There is no limit to the number of tracks. HOWEVER, total play time must be 79 minutes or less but we recommend no more than 74 minutes (see notes about total play time below).
  2. We DO INCLUDE a 0.75 second gap between tracks. If you do not want this, you'll have to make a working CD the way you want it and mail it to us.

A true audio CD can be at most 79 minutes in total play time but we recommend no more than 74 minutes since some older CD players can not play more than that and your last track will be cut off.
If your recordings are more minutes than that, either break them down into multiple disc sets or modify your project and make it a Data CD. A Data CD is not limited by total play time. It's limited by file size only. For example, a Data CD of .MP3 files can play for hours in a computer, some car CD players, some game systems and some bluray or DVD players. The drawback is that a data CD is not going to play in an older CD player. A Data CD of MP3 or WAV files can easily be imported into iTunes from your computer for example.

If possible, you should try to make your discs 74 minutes or less to be compatible with most CD players.
High capacity blank media like ours CAN record up to 79 minutes, but not all CD players can play more than 74 minutes. The last track or the last part of a track might not fully play in all CD players even though it would play on a computer. To be most compatible, try to keep it under 74 minutes.

Burn Errors: If we try to burn your audio CD and our system gives us an 'insufficient space' error, we'll have to inactivate the project and you'll have to edit down and shorten the disc, or add a 2nd disc to the set (split it up into another disc). We will not know this until you order a copy at which point we download it once, and try to burn it. Once we know it works at least once, there will not be any future errors.

The names of your files are not very important for true Audio CDs.
When an audio CD is made, the files are renamed as Track01.CDa, Track02.CDa ... If you look at the image, you can see the information a computer will see when an Audio CD is loaded. It does not matter what you've named your .MP3 or .WAV file. Once the Audio CD is made, the file names change.

However, some CD Text data is stored on the Audio CD that does contain some of your file name and publisher information, but that is not important when played on a standard CD player.

Step 2: Create a .zip or .rar file:

Zip up your .MP3 or .WAV files into a single .zip (or .rar) file.

Each disc is a single .zip or .rar file. Before we burn the audio CD, we unzip the files first, and use those .MP3 or .WAV files to make the audio CD.

Not sure how to zip up files? Learn More

Step 3: Upload the file:

You have some choices on what to do with the zip or rar file when you've made it:

1) You may upload your file directly to the TrepStar Project. Edit your project, click the green upload button, and select your zip file.

2) You may upload your file to your website, then edit the TrepStar project and type in the URL to that file on your server.

3) You may upload your file to a cloud service like Amazon S3. Make that file public, get the URL, then edit the TrepStar project and type in the URL to that file on your server. Learn More about Amazon S3

Too much work? Let us do the file preparation for you:

If you would rather skip the file preparation step, or want complete project setup support, you have a few options. Learn More

Other Considerations:

  1. With true audio CDs, the names of your WAV or MP3 files are not important and do not get saved to the disc. They are lost when burning an audio CD. You can give your files a descriptive name but that name is only stored in the CD text.
  2. To have iTunes and other services recognize your new music CD, You need to upload the track and CD title information to the free service at You can also add this data on your own computer through iTunes after importing your CD to iTunes. Then the titles of the tracks and the CD title will appear when the CD is uploaded on any computer to iTunes or Windows Media.
  3. For audio CDs, only .MP3 or .WAV are allowed. You can not have an audio CD contain .pdf files for example. That type of disc would be considered a data CD that would play in a computer and have a 700MB capacity. If that's all you need, change your project options and pick a data CD.
  4. You may also consider creating a DATA CD containing many MP3 files. CDs can hold about 700MB of data. A DATA CD of MP3 files could easily hold over 100 songs, but those files would need to be played in modern devices a computer, PSx, XBOX, modern CD/DVD players, modern car CD players that would recognize those formats (MP3). However, data CDs are not compatible with old CD players, or older car CD players or boomboxes. You would want to make a data CD of MP3 files if you wanted customers to use your disc in their computer, or import it into iTunes from their computer. You can store hours of audio on a data CD if it's in MP3 format since a song in MP3 format is usually about 10 times smaller in file size than a WAV file of the same length of play time. Some newer Car CD players can play data CDs that contain .MP3 files.
  5. The actual files you give us are converted to .CDa files. These files are created by our system when the disc is burned as an audio CD, and the source .MP3 or .WAV file is used to create these files. The total play time is just under 79 minutes but we recommend you limit your CD to 74 minutes to best most compatible with all audio CD players..