iTunes

• 1). Open iTunes.
  
  
• 2). Click "File," "Preferences" on a PC or "iTunes," "Preferences" on a Mac.
  
  
• 3). Click "Import Settings" inside the preferences menu and select the "MP3 Encoder."
  
  
• 4). Select "Custom" from the "Settings" menu.
  
  
• 5). Click the "Stereo Bit Rate" menu and select 320 Kbps.
  
  
• 6). Click "OK" to apply these changes to your iTunes settings.
  
  
• 7). Drag the MP3 you want to convert to 320 Kbps into iTunes.
  
  
• 8). Highlight this MP3, click "Advanced" and select "Create MP3 version." When the conversion is complete a 320 Kbps MP3 will appear below the original file (See References 1).
  
  

Switch

• 1). Open Switch.
  
  
• 2). Click "Add Files" and choose the MP3 you want to convert to 320 Kbps.
  
  
• 3). Select ".mp3" from the "Output Format" drop down menu.
  
  
• 4). Click "Encoder Options" and select 320 Kbps from the "Bit Rate" menu.
  
  
• 5). Click "OK" to apply these changes.
  
  
• 6). Click the "Browse" button and choose an "Output Folder" to save your converted MP3 in.
  
  
• 7). Click "Convert" and the MP3 will be converted to 320 Kbps (See References 2).
  
  

dBpoweramp

• 1). Open dBpoweramp.
  
  
• 2). Click "Browse" and choose the MP3 you want to convert to 320 Kbps.
  
  
• 3). Select "MP3" from the "Converting To" drop down menu.
  
  
• 4). Drag the "Estimated Bit Rate" slider to select 320 Kbps.
  
  
• 5). Click the "Folder" button and choose an "Output Location" to save your converted MP3 in.
  
  
• 6). Click "Convert" and the MP3 will be converted to 320 Kbps (See References 3).