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The sound effects for R2-D2's "voice" were created by sound designer Ben Burtt, using an ARP 2600 analog music synthesizer, as well as his own vocalizations processed through other effects.
Votes:
3724
R2D2
74.3%
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The name C-3PO comes from Lucas' hometown map. The post office was located in grid C-3.
Votes:
1285
C3PO
25.7%