The only ways i can think of to do this is:

• Set up two amps at once in stereo panned hard left and right.
• make one amp distorted, the other clean.
• Put a stomp box delay in front of the clean amp.
• futz around with the stomp's levels and the clean amp's panning to get the delay where you want it.
• adjust the panning of the distorted amp to try to balance the stereo field.
• The only delay repeats that you should hear will be from the clean amp.

Unfortunately, i don't imagine that this will sound very good....

You MIGHT be able to do the same thing with a post delay, since i think some of them let you control the left and right levels.

Sorry for not being clear; i just got a new computer and don't have Edit up an running at the moment.

Hope this helps,

Good Luck,

Joe