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In this forum post someone details how to install and set default voices for festival under ubuntu, an undergraduate group here is using it to select their voices. This doesn't give you the ability to select the voice in the message sent to sound_play, but rather sets it for the whole system.

http://ubuntuforums.org/showthread.php?t=751169

Particularly I think you would be interested in this config file (/etc/festival.scm):

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;;
;;;; setup audio output
;;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

;;;; defaults to oss output

;;;; use pulseaudio to output sound
;;(Parameter.set 'Audio_Command "paplay $FILE") 
;;(Parameter.set 'Audio_Method 'Audio_Command)
;;(Parameter.set 'Audio_Required_Format 'snd)

;;;; use esd to output sound
;;(Parameter.set 'Audio_Command "esdplay $FILE") 
;;(Parameter.set 'Audio_Method 'Audio_Command)
;;(Parameter.set 'Audio_Required_Format 'snd)

;;;; use alsa to output sound
;;(Parameter.set 'Audio_Command "aplay -D plug:dmix -q -c 1 -t raw -f s16 -r $SR $FILE") 
;;(Parameter.set 'Audio_Method 'Audio_Command)
;;(Parameter.set 'Audio_Required_Format 'snd)


;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;;
;;;; setup voices
;;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

;;;; Festvox voices
;;(set! default_voice 'voice_rab_diphone)
;;(set! default_voice 'voice_don_diphone)
;;(set! default_voice 'voice_kal_diphone)
;;(set! default_voice 'voice_ked_diphone)

;;;; MBROLA voices
;;(set! default_voice 'voice_us1_mbrola)
;;(set! default_voice 'voice_us2_mbrola)
;;(set! default_voice 'voice_us3_mbrola)

;;;; CMU Arctic voices
;;(set! voice_default 'voice_cmu_us_rms_arctic_clunits)
;;(set! voice_default 'voice_cmu_us_bdl_arctic_clunits)
;;(set! voice_default 'voice_cmu_us_slt_arctic_clunits)
;;(set! voice_default 'voice_cmu_us_clb_arctic_clunits)
;;(set! voice_default 'voice_cmu_us_awb_arctic_clunits)
;;(set! voice_default 'voice_cmu_us_jmk_arctic_clunits)

;;;; Nitech HTS voices
(set! voice_default 'voice_nitech_us_rms_arctic_hts)
;;(set! voice_default 'voice_nitech_us_bdl_arctic_hts)
;;(set! voice_default 'voice_nitech_us_slt_arctic_hts)
;;(set! voice_default 'voice_nitech_us_clb_arctic_hts)
;;(set! voice_default 'voice_nitech_us_awb_arctic_hts)
;;(set! voice_default 'voice_nitech_us_jmk_arctic_hts)
;;(set! voice_default 'voice_cmu_us_kal_com_hts)
;;(set! voice_default 'voice_cstr_us_ked_timit_hts)


;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;;
;;;; Advanced voice configuration
;;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

;;;; Slow the HTS speech down.
;;(set! hts_duration_stretch 0.1)

;;;; Slow the standard voices down
;;(Parameter.set 'Duration_Stretch 2.5)

;;;; Set volume.
;;(set! default_after_synth_hooks
;;    (list (lambda (utt) (utt.wave.rescale utt 2.0 t))))

In this forum post someone details how to install and set default voices for festival under ubuntu, an undergraduate group here is using it to select their voices. This doesn't give you the ability to select the voice in the message sent to sound_play, but rather sets it for the whole system.

http://ubuntuforums.org/showthread.php?t=751169

Particularly I think you would be interested in this config file (/etc/festival.scm):

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;;
;;;; setup audio output
;;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

;;;; defaults to oss output

;;;; use pulseaudio to output sound
;;(Parameter.set 'Audio_Command "paplay $FILE") 
;;(Parameter.set 'Audio_Method 'Audio_Command)
;;(Parameter.set 'Audio_Required_Format 'snd)

;;;; use esd to output sound
;;(Parameter.set 'Audio_Command "esdplay $FILE") 
;;(Parameter.set 'Audio_Method 'Audio_Command)
;;(Parameter.set 'Audio_Required_Format 'snd)

;;;; use alsa to output sound
;;(Parameter.set 'Audio_Command "aplay -D plug:dmix -q -c 1 -t raw -f s16 -r $SR $FILE") 
;;(Parameter.set 'Audio_Method 'Audio_Command)
;;(Parameter.set 'Audio_Required_Format 'snd)


;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;;
;;;; setup voices
;;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

;;;; Festvox voices
;;(set! default_voice 'voice_rab_diphone)
;;(set! default_voice 'voice_don_diphone)
;;(set! default_voice 'voice_kal_diphone)
;;(set! default_voice 'voice_ked_diphone)

;;;; MBROLA voices
;;(set! default_voice 'voice_us1_mbrola)
;;(set! default_voice 'voice_us2_mbrola)
;;(set! default_voice 'voice_us3_mbrola)

;;;; CMU Arctic voices
;;(set! voice_default 'voice_cmu_us_rms_arctic_clunits)
;;(set! voice_default 'voice_cmu_us_bdl_arctic_clunits)
;;(set! voice_default 'voice_cmu_us_slt_arctic_clunits)
;;(set! voice_default 'voice_cmu_us_clb_arctic_clunits)
;;(set! voice_default 'voice_cmu_us_awb_arctic_clunits)
;;(set! voice_default 'voice_cmu_us_jmk_arctic_clunits)

;;;; Nitech HTS voices
(set! voice_default 'voice_nitech_us_rms_arctic_hts)
;;(set! voice_default 'voice_nitech_us_bdl_arctic_hts)
;;(set! voice_default 'voice_nitech_us_slt_arctic_hts)
;;(set! voice_default 'voice_nitech_us_clb_arctic_hts)
;;(set! voice_default 'voice_nitech_us_awb_arctic_hts)
;;(set! voice_default 'voice_nitech_us_jmk_arctic_hts)
;;(set! voice_default 'voice_cmu_us_kal_com_hts)
;;(set! voice_default 'voice_cstr_us_ked_timit_hts)


;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;;
;;;; Advanced voice configuration
;;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

;;;; Slow the HTS speech down.
;;(set! hts_duration_stretch 0.1)

;;;; Slow the standard voices down
;;(Parameter.set 'Duration_Stretch 2.5)

;;;; Set volume.
;;(set! default_after_synth_hooks
;;    (list (lambda (utt) (utt.wave.rescale utt 2.0 t))))