Originally Posted by New Tricks
No you don't.
The sound will come from your TD. The GB settings can change the overall sound but you don't have to use it. Just choose no effects.
I had to tweak my TD settings a bit a bit to get the same sound as I do from the PA but it wasn't difficult. Just build or tweak a kit for recording. The Detailed drums helps my overall sound.
But....I just realized that I use my Zoom R16 as a controller for GB. Maybe that's why it seems so simple. I have not tried to run directly to the computer.
Midi has no sounds of its own, so if the OP is going through the USB-Midi route, he will have to use a VST like GarageBand to output sound.
Connecting direct to the Mac using the line in is an option, but you're likely to get even worse sound than Garage Band, since the input is unlikely to be suitable for line level signals. As such, you'll have to deal with the sound distorting, or lower it to a level that's almost inaudible and then try to hike it up using a software preamp.