Hello,

I have compiled (not installed yet):
Code:
Festival Speech Synthesis System 2.4:release December 2014
Copyright (C) University of Edinburgh, 1996-2010. All rights reserved.

clunits: Copyright (C) University of Edinburgh and CMU 1997-2010
clustergen_engine: Copyright (C) Carnegie Mellon University 2005-2014
hts_engine: 
The HMM-Based Speech Synthesis Engine "hts_engine API"
hts_engine API version 1.07 (http://hts-engine.sourceforge.net/)
Copyright (C) The HMM-Based Speech Synthesis Engine "hts_engine API"
Version 1.07 (http://hts-engine.sourceforge.net/)
Copyright (C) 2001-2012 Nagoya Institute of Technology
              2001-2008 Tokyo Institute of Technology
All rights reserved.

All rights reserved.
For details type `(festival_warranty)'
festival>
So, I am working in my Download/festival folder on:
Code:
dario@dario-Lenovo-G460:~$ lsb_release -a
No LSB modules are available.
Distributor ID:    Ubuntu
Description:    Ubuntu 14.04.5 LTS
Release:    14.04
Codename:    trusty
dario@dario-Lenovo-G460:~$
Everything seems to be working ok.

I have the following voices available:
Code:
festival> (voice_
voice_cmu_us_ahw_cg              voice_cmu_us_clb_cg              voice_cmu_us_rms_cg              voice_nitech_us_bdl_arctic_hts
voice_cmu_us_aup_cg              voice_cmu_us_fem_cg              voice_cmu_us_rxr_cg              voice_nitech_us_clb_arctic_hts
voice_cmu_us_awb_arctic_clunits  voice_cmu_us_gka_cg              voice_cmu_us_slt_arctic_clunits  voice_nitech_us_jmk_arctic_hts
voice_cmu_us_awb_cg              voice_cmu_us_jmk_arctic_clunits  voice_cmu_us_slt_arctic_hts      voice_nitech_us_rms_arctic_hts
voice_cmu_us_axb_cg              voice_cmu_us_jmk_cg              voice_cmu_us_slt_cg              voice_nitech_us_slt_arctic_hts
voice_cmu_us_bdl_arctic_clunits  voice_cmu_us_kal_com_hts         voice_cstr_us_ked_timit_hts      voice_rab_diphone
voice_cmu_us_bdl_cg              voice_cmu_us_ksp_cg              voice_kal_diphone                voice_reset
voice_cmu_us_clb_arctic_clunits  voice_cmu_us_rms_arctic_clunits  voice_nitech_us_awb_arctic_hts
festival> (voice_
I installed enhanced CMU Arctic voices in
Code:
~/Download/festival/lib/voices/english/
I changed the name with the _clunits sufix as you suggested and they worked well.

Then, I tried to install the enhanced Nitech HTS voices.
In
Code:
~/Downloads
I typed
Code:
mkdir hts_tmp
and
Code:
cd hts_tmp
I extract (tar) the voices there.
I moved the voices
Code:
mv lib/voices/us/* ../festival/lib/voices/us/
And, I typed
Code:
mv lib/hts.scm ../festival/lib/hts.scm
Then from
Code:
~/Downloads/festival$
, I lunch festival with
Code:
bin/festival
I test the voice and:

Code:
festival> (voice_nitech_us_awb_arctic_hts )                                                                                             nitech_us_awb_arctic_hts
festival> (SayText "It is supposed to be a wonderfull voice.")                                                                                       
Warning: HTS_fopen: Cannot open hts/htsvoice.
rateconv: failed to convert from 16000 to 0
#<Utterance 0x7fe14a787c50>
festival>
What could be the problem here?

Thanks in advance