I havent done it with actual voices (yet).

Ide like to import my own bass samples and if possible - new grand piano voices.. but from what i have seen / heard I am not liking my chances.

would be great if there were some third party sites selling voices that import straight into the T4 just how you can for the Motif Series but unfortunately I cant seem to find any.

At least for now I have addressed the drums which is great.

Most folks here say they are happy with the standard built in drums but they just didn't cut it for me.