I agree: a lot of times you want the sample to sound dirty. There are other ways to go about doing that. But ya I suppose if the sample rate is 192 kbps then it won't make much of a difference. Although I must note that he never specified what sample rate his mp3s were, and I just wanted him to be aware that mp3s aren't as good as wav's in terms of quality, in case he was aiming for the cleanest possible sample. Obviously, if you are going for a lo-fi sound then you don't need superior quality.
- Dirty Rice