Your question is too vague. Recorded how ? Through a video camera ? If so, you could try EQing in a video editor, but this will not be specific to just the bass guitar, of course, just the overall sound.
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Originally Posted by *insertcoolname
1nce at a gig i roxed the crowd so hArd that all teh gurlz were liek "i want u" an all teh bands were liek "u roxed evry1 2 hard" and i waz liek "yea i no cuz i am teh mastr uv base"
Export the audio out of the video. Bring it into a DAW program and increase the volume of the track, and rerecord it to a new track with the volume set to "0". Repeat this process until you have the desired volume. EQ'ing is a different story all together.
