OK,
Here's a solution that I do to make the drums and other instruments sound more to live instruments and drums for when I go out playing on gigs and it works great.
If you have the software (eg: Digital Orchestrator Plus) here's what you do:
WHAT I DO IN DIGITAL ORCHESTRATOR PLUS:
1. Copy each Seperate (eg: Cymbals, HiHat, Snare, Kick, Tom1, Tom2, Tom3) and paste them into individual tracks.
2. Highlight all the tracks in Track View and set velocity(volume) to 127 and all tracks will be loud.
3. In Track View, select the snare track and [Ctrl+C]copy
4. Find the next available track and [Ctrl+V]paste the snare track in there. You should now have 2 copies of the snare.
5. Do Step 3 and 4 until you get the desired meaty live sound for the drums.
6. You will now find that you'd need to also update your bass guitar to match. I use two types the Picking bass X2 and the Slap bass X2 X2=how many tracks for each.
7. Adjust the volume slider controls for slap to suite, it's for clarity purposes only and if you want, you can use Acoustic Bass. But be careful that you don't get the destorted sound with too much Acoustic Bass.
You can do all the above if you have a good sound card and the appropiate midi software.
I use a SBLive card. Digital Orchestrator Plus and a Mini-Disk Recorder/Player for finished results.
I hope this helps.