system('echo "' . $text . '" | text2wave -scale 1.5 -F 8000 -o ' . $filename . ' - ');

system('echo "' . $text . '" | text2wave -eval
"(voice_cmu_us_slt_arctic_hts)" -scale 1.5 -F 8000 -o ' . $filename . ' - ');