Here’s a little arpeggio I recorded using my Roland D-50 and the factory preset, Vara Coma Veri La. A quick search shows that the patch, somehow on my D-50s internal memory, was part of the Cinascope Studio soundbank programmed by Paul Naton. All the processing heard is native to the D-50. No additional processing was added. Patches like this really show off the spacial qualities of the instrument with hard, slow auto-pan drenched in reverb.
Spacey D50 Arpeggio