There are two different sound formats in Guitar Pro 6: MIDI and Realistic Sound Engine (RSE). Each sound family has its advantages:
- MIDI is a very light format that works on a wide range of computers
- RSE is a format that can create realistic scores/tabs
To create a realistic sound using RSE, you have to set the effects of the instrument track you are using. Find tips in this video to make it easier to use sound in your tabs/scores.