Hi,

There are a few synth RealTracks, but they're all labelled as such. The vocal RealTracks are human voices.

Though the attack on some of the notes can be a bit awkward, I'm not hearing the buzz or harshness. If you are, EQing out some of the high-mid frequencies may help fit them in your mix.

You'll also want to make sure you're using them at close to their original tempo, speeding them up or slowing them down too much may be affecting the sound quality.

Thanks
Kent
PG Music