Vote
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:
3597
R2D2
75.9%
Vote
The name C-3PO comes from Lucas' hometown map. The post office was located in grid C-3.
Votes:
1141
C3PO
24.1%