best VST for using guitar as a bass?

[Cacoph0ny]

I'm recording something in Drop A and I don't have a bass I can tune that low atm so I want to just use guitar. Is there any free plugin out there that won't make it just sound like a huge fart?

 

[Mutant]

Reaper has fantastic quality pitch shift algorithms.

 

[pattonfreak1]

Reaper has fantastic quality pitch shift algorithms.

+1