Beginner's question on unintended sound reduction

Hi.
I've noticed that when I export a multitrack mixdown into an mp3 file, the new mp3 file will sound slightly quieter than the original sound files I've used. I've done a simple experiment and kind of confirmed this so I know it isn't just my ears playing tricks on me.
What I did was I took a random mp3 song file, dropped it into Track 1, did absolutely no editing on it and exported it (File > Export > Multitrack Mixdown > Entire Session) as another mp3 with a different name. Then I took this newly exported mp3 and dropped it into Track 2. If you look at their waveform, Track 2 has "shorter lines" in its waveform throughout the whole song, which to me means the sound is "less loud".
I seriously did no editing before exporting. I didn't lower the dB on either track. When I exported, I matched the same Sample Rate/Bit Depth/Kbps as the original mp3. The only difference I see is that the original mp3's source format says "mp3 320 Kbps CBR", and the newly exported mp3 says "MP3 320 Kbps CBR OFL".
I don't know if that is the reason, but I'm guessing it's not.
So why does this happen? Could it be "fixed" if i simply turn up the dB on Track 2? Or did I actually lose audio quality after exporting?
Please help

StormCloudSeven wrote:
So why does this happen? Could it be "fixed" if i simply turn up the dB on Track 2? Or did I actually lose audio quality after exporting?
It's caused by the pan law setting in Multitrack (go to Preferences>Multitrack). If you pick the Left/Right Logarithmic setting instead of -3dB center, your file will export at an identical level to the one you've already got.

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test.vi ‏10 KB

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Cody99 wrote:
Hello everyone, I apologize if this question has been asked dozens of times, but it's something I've dug through countless number of posts to find an answer to. I bought a sennheiser pc 350 headset this past weekend along with a sound blaster x-fi x-treme gamer sound card. I opened up my case, plugged the card into the pci slot, screwed it down and finally plugged in the power cable into the card. Upon bootup I disabled the on board sound in the BIOs, although I did notice that the optical out slot emitted a redish light, which I'm not sure indicates a problem or not.
Anyways, after booting up the computer detects the new hardware, so I install everything on the vista CD before going online and downloading the latest drivers off the creative website. I'm running Vista 64 bit ultimate btw. After installation I reboot the system and hook my microphone into optical out and my headset into line . I ended up getting sound in my headset just fine, but no matter what I did I could not for the love of me get the mic to work. And that's the sole problem, the little microphone lol. I've read several posts about the same thing, although they date awhile back and I was hoping a solution has emerged since. I've read that on the x-fi control panel line and mic need to NOT be muted, but whenever I unmute on, it mutes the other. I also find the digital I/O setting tab which also may be the culprit, as it has the selection for mic-in/line , but I can't select it!
Otherwise I believe everything is fine.. in the control panel under speech recog options I went into advanced settings under speech recog and set the sb xfi mic to the default... and yes, in the sound tab the mic is the default with everything else being unavaible and the auxiliary being disabled ( is this ok? ) and in playback speakers are the default rather than spdif out - not sure which should be the default. The mic, speakers, and spdif say they are all "working" and although playback works... no recording.
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Sounds like you have misapprehended something regarding usage of analog and digital I/Os?
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Message was edited by: macjack

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