To get the
best professional widening effect its probably best to not just use the Haas effect (delay one side as discussed here) but also to alter the tuning, formant and random timing as well on the delayed side. Here is an example of how I do it, but it needs Sonar version with Melodyne. It also sounds less cancelled and comb filtered when collapsed to mono.
1. Clone the track
2. Pan one track full left and other full right.....you can alter this to taste later
3. On the R track add sonar channel tools
4. Set channel tools to stereo input mode and set delay R to around 30mS. Set both sliders far right
5. Enable melodyne on R track clip by selecting clip and picking Region FX - Melodyne
6. In melodyne select all.
7. In melodyne Edit, Add Random Deviations- Pitch Drastic
8. In melodyne Edit Random Deviations - Timing Drastic
9. In melodyne use formant tool to lower formant a little
10. Bounce the clip to render the changes.
11. Pan and volume balance as required. Also as you have effectively spliot the track you can add different effects to left and right if required.
a little long winded I know but you soon get used to it. What has been done here is L is untouched, R is delayed , then random tuning, random timing added and formant slightly changed. This give a wide effect with a double tracking sound.
Let me know if it worked for you :)
Hope helps.
Chris.