I've wanted for some time to make a simple "robot voice" vocoder effect in Csound. This mp3 contains an original sample, followed by a 40-band sine wave vocoded version, then a 40-band sawtooth wave version, then a 10-band sine wave version, an upside-down version and then a 40-band filtered noise version. The key to all of this is Csound's balance opcode. Here are the Csound orchestra and score files.
The output bands are split to the left and right channels, so though the original sample is mono, the output is quite stereo.
Much of the guts for this orchestra file were copied from a more general-purpose Csound vocoder example at www.thumbuki.com.