Both synths are digital and use the same samples and synthesis method (LA Synthesis), but the synth engine is implemented on different hardware. In addition, the D-05 introduces some new features, like having the original D-50 sound cartridges built in, and offering an on-board sequencer.
Pricing and Availability:
The Roland D-05 is available to pre-order now, with a street price of US $350. See the Roland sitefor more details.