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VBR stands for Variable Bit Rate and CBR for Constant Bit Rate.
I tried explain them a bit but try wikipedia if this is confusing lol :
on 192 CBR mp3 the bit rate always stays at 192 . on VBR mp3 the bit rate varies according to the mp3 , more sounds higher the bitrate. on the more silent parts of the mp3 the bit rate is lower. The idea behind VBR is to save in file sizes & and there are different quality VBR around. some are for example from 128 kbps ~ 224 kbps and some could be from 192 kbps ~ 320 kbps.
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