the group had disbanded in 1980 , but three of the band 's members -- claudio simonetti ( roland jupiter-8 , roland vocoder plus , minimoog , piano , electric piano , oberheim dmx digital drum , roland tr-808 , roland mc4 computer ) , fabio pignatelli ( fender bass normal and fretless ) , and massimo morante ( electric and acoustic guitar ) -- reunited at argento 's request to work on tenebrae .