
A bit like the "tips+tricks" category but more informal and not necessarily specific to Live. I'll start with a couple of my own secrets and if more come to mind I'll note them as well.
First one is on recording an electric guitar through an amp.
1. Select your favourite settings without plugging your guitar to the amp yet.
2. Put a really high volume and place your mic in front of your amp in a stand.
3. Now listen very carefully through your headphones the return.
4. Scan with your mic the horizontal axis and lock your stand at the point where the amp has the highest "hiss" in pitch.
5. Now do the same on the vertical axis. Finally lock your mic at the position where your amp produces the highest (in frequency) hiss. This is the sweat spot of your amp

Second one is a simple one.
1. Group all your drums (kick, snare, hats, percussion) in a subgroup and compress lightly using your favourite compressor. (Really low ratio such as 1.4:1 or 2:1)
2. Now mix your compressed drums with the uncompressed subgroup. (This trick can even be used at your final mix).
C'mon people, your turn!