I was just wondering, if i get a pedal (which i am about to) an i plug it in through my amp into my bass/guitar, will it change the tone at all if its not on ?
Depends on the pedal and how good your ear is.

If it's true bypass and/or you don't have a good ear then you shouldn't notice but if it's not true bypass and you have a good ear then you might very well notice.
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I'm probably going to get a boss and yes lol i guess you can say my ear is pretty good, and okay thanks for the help