In HTS-demo script, post-filtering technique is not used for waveform
generation.
However, you can use it by "hts_engine" instead of "HMGenS" when
synthesizing speech from HMMs.
"hts_engine" is invoked by typing the command line
hts_engine -dm mcep_dyn.win \
-dm mcep_acc.win \
-df lf0_dyn.win \
-df lf0_acc.win \
-td tree-dur.inf \
-tm tree-mcep.inf \
-tf tree-lf0.inf \
-md duration.pdf \
-mm mcep.pdf \
-mf lf0.pdf \
-b 0.3 \
input.lab
"{mcep,lf0}_{dyn,acc}.win" are included in the distribution.
"tree-{mcep,lf0,dur}.inf" and "{mcep,lf0,duration}.pdf" are generated
by HTS-demo script at HTS-demo/voices.