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rio car dot org FAQ (Frequently Asked Questions)

Category: Main -> MP3 creation and playback questions
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·  What is the best way to create MP3s? 
·  How should I name my MP3 files and ID3 tags? 
·  What tools can I use to diagnose and repair problems with my MP3 files? 
·  Can I increase the quality of an MP3 by decoding and re-encoding it? 
·  How does the player handle gapless playback? 
·  How can I create files that will play back gaplessly on the player? 
·  Why do all my songs play at different volumes? 
·  If I normalize my MP3s, will they sound like they are at the same volume? 
·  Can I use software to apply a "relative volume" offset to each track so they can sound equal? 

·  So how do I do dynamic range compression at playback time?
 (Entry last updated on July 28th, 2003)

For your Rio Car, there's Richard Lovejoy's Volume Adjustment Kernel. It is a dynamic range compressor that works in real time during playback by intercepting the audio stream and altering it before it's sent to the DSP. It makes the quiet parts louder. Its main purpose is to make the quiet parts of songs rise above the noise floor of the car environment while you are driving. But it also helps make songs sound like they are closer to equal in volume.

The volume adjustment code is available as part of Mark Lord's Hijack Kernel, under the heading 'Auto volume adjust' in its main menu. You have the ability to turn it on and off and set the degree of adjustment from this menu. See http://rtr.ca/empeg to get it.

Note that this changes the character of the way some songs sound. Depending on the song, it may be subtle or it may be overt. That's the nature of compression. If you decide you don't like it, you can turn it off.

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