MP3s can be encoded at different sample rates depending on the source audio and settings chosen. Most music MP3s and the standard commercial audio CD are encoded at 44100 (44.1 kHz) and in 16-bit audio quality. MP3s that are encoded in 48000 (48kHz) cannot be burnt to audio CD. With the aid of iTunes or a basic audio editing suite, users can convert their MP3s from 48 kHz to 44.1 kHz.
Open iTunes. Download and install it for free if it's currently not installed on your computer (see Resources).
Click on the "Edit" menu at the top and then select "Preferences." Click on "Import Settings" in the "General" tab.
Select MP3 Encoder from the "Import Using" pull-down menu. Choose "Custom..." from the "Setting" pull-down menu. An "MP3 Encoder" window will pop up.
Choose the quality you want to encode your new MP3 to from the "Stereo Bit Rate" menu. Choose "44.100 kHz" from the "Sample Rate" menu. Click "OK" to close the MP3 encoder and then "OK" again to close the import settings window. Click "OK" to confirm your Preference changes.
Drag and drop the MP3 file you want to convert into iTunes. Highlight the file in iTunes and then right click on it and select "Create MP3 version." A "Converting" icon will pop up under the "Playlists" column on the left. Wait for your MP3 to convert. Your converted MP3 will now show up in your iTunes Library under the original file it converted.
Launch Adobe Audition (see Resources). Click on the "File" and select "Open." Locate the file you want to convert and click "Open."
Press "F11." Select "44100" from the Sample Rate window and 16 bit in the resolution window. Click "OK." Your file will be converted.
Click on the "File" menu and select "Save As." Choose what folder you want to save your MP3 to.
Select "mp3PRO" from the "Save As" type pull-down menu and then click "Save." Your MP3 is now converted.
Open Ableton Live (see Resources for link to 30-day free trial). Drag and drop the MP3 you want to convert to any open clip in the Ableton session view.
Press "Tab" to switch to the arrangement view. Set the loop markers at the top of your screen to cover the entire length of the track.
Click on the "File" menu and select "Export Audio/Video." Under the Audio section change the Sample Rate to "44100" and the Bit Depth to "16" and click "OK."
Choose where you'd like to save your converted MP3 and click "Save." Your file is now converted to 44100.