If you want to know what a booster is, what are the different kinds of boosters and where you would put one in you signal chain then you clicked on the right video. This video should explain why you would use/need one and the different purposes they serve.
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0:00 intro
0:21 what is a booster?
0:37 Reasons why you would use a boost
3:29 clean boost/boosting volume
5:43 boosting gain
8:03 Treble boost
12:49 EQ pedal
13:43 Overdrives as a boost
15:03 Tube Screamer as a boost
16:46 Pastfx TDY
18:14 EP Booster
19:55 Thanks for watching