I haven't even listened to synth lead sounds. What I'm referring to mostly are the bread and butter sounds such as guitar, piano, brass, sax, as set up in the OTS memories. There are some excellent Electric Piano and organ setups as well as nice string and vocal layers.
Every sound is extremely editable. For instance you can take a guitar sound and work with the e.q., reverb, delay, enhancer, distortion, overdrive, amp simulation and more. What you can do to a sound is pretty much unlimited. On some of the sounds you can trigger various effects with touch, key pressure and/or after touch.
On organ you can change such things as the speed of the rotary on Leslie simulation, the start-up rotary time and wind-down time. You can make it clean or various degrees of "dirty", including types and degrees of percussion. I haven't gotten into doing much of it, but Roland has on some of the OTS presets.
I believe they have implemented a lot of this better than they did on previous boards.

DonM