Okay I think I figured out a decent way to get stereo delays with character in the GT-1000 and Core:
- Run a divider loop in "dual" mode
- On one path, put the master delay block in; set the direct level to 0 and effect level to taste
- After the master delay block, put an FX block in; change the FX type to "chorus" and model to "stereo 1"
- Adjust the stereo width of the delay by increasing or decreasing the pre-delay of the chorus
- To toggle the delay chain on/off, add one of the basic delay blocks before the master delay, then set the effect and direct levels to "0" (always keeping the master delay and chorus on)
Basically what you are doing is running the delay in parallel, and running the mono delay into a stereo widening via a Haas effect.