 Vince Clarke began using the MC-4 on Yazoo's debut album "Upstairs at Eric's" in 1982.After a good friend noticed that his later albums had changed in sound, Vince Clarke realised this had been due to his having changed from using a Roland MC-4 Microcomposer to using MIDI sequencers.So in 1991 he returned to using MC-4 sequencers for the recording of the Erasure album "Chorus".