take a mono source and apply a very short delay to one side.... 0.1 to 3ms...

this will allow you to pan thing outside the traditional stereo image.... aka hass panning....

but it's hard to get to translate well on other systems

But man hass effect occurs after 10 ot 20 ms... i tried this thing there is'nt any noticeable difference you start hearing the difference after 5 ms but thats not the thing i was asking....any ways thanx man....
peace

There are some cheap tricks that you can use on a mix, such as:

1- Inverting the left channel and mixing it into the right channel at -4 dB, and vica versa.

2- As above, but adding a 2 ms of straight delay to the cross-feed signals. (This is about IACC/HRTF, not Haas, for those that care....)

3- Taking the pure wet signal from a dense MONO reverb and mixing it into L and R in opposite phases. (Eg- return it to L "in phase" and return it to R "out of phase.")

However,

Most of what you hear on commercial recordings has probably been done with a special-purpose signal processor (or plug-in), such as Q-Sound or Roland RSS.