Yup, Plankis already summed it up.
I use ReaDelay like this, if I want to broaden up a single take, or create a hole in the center without things sounding offbalance; for example if there is a solo and a vocal playing at the same time.
Set dry signal to 0%. Set first tap to 0 delay time, and pan it to how broad you want the final stereo image to be. So for example 0.3 panning. Then set the delaytime of the second tap to somewhere below where the 2 signals start to sound like individual tracks. I usually end up between 12 and 18ms delay. Now pan this second tap to the mirrored position of the first one. So in this case -0.3.
If the panning and time difference is extreme, you may have to add a db or 2 to the second tap, to make it sound balanced again.
An important note here: check in mono when setting this! Especially on low delaytimes it can cause severe combfiltering, so find a nice balance between what sounds good in mono and stereo.
Btw, I think adding a second tap with a similar short delay works incredibly well for thickening up vocals and leads, even without the panning and stereo trickery. Thickens thing up nicely, while still being more subtle than chorus or the classic slapback delay.