#1
wondered the best way to get distorted lo-fi sounding vocals?

I'm recording some real bluesy stuff so was looking how to get that warm blues distorted vocal sound

I use Sonar to record with, so would it be best just to get an effect and shove it on to the vocal track after recording it?

cheers
#2
Distortion pedal?

There are vocal processors which have distortion on them.
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#3
Lo-fi pedals work well for distorting vocals, there's an ibanez one which apparently does the trick quite well.