tao2wav: command not found

Have You tried accessing the binary with the full path?

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/tao2wav - from package: taopm

You may install the required package with command apt-get install {package}
Error in other languages:
tao2wav: bevel nie gevind nie
tao2wav: comandă negăsită
tao2wav: comando não encontrado
tao2wav: commande introuvable
tao2wav: command not found
tao2wav: käsku ei ole
tao2wav: không tìm thấy lệnh
tao2wav: komanda nerasta
tao2wav: Kommando nicht gefunden.
tao2wav: kommandot finns inte
tao2wav: komut yok
tao2wav: nie znaleziono polecenia
tao2wav: níor aimsíodh an t-ordú
tao2wav: no se encontró la orden
tao2wav: no s'ha trobat l'ordre
tao2wav: opdracht niet gevonden
tao2wav: parancs nem található
tao2wav: perintah tidak ditemukan
tao2wav: príkaz nenájdený
tao2wav: příkaz nenalezen
tao2wav: команда не найдена
tao2wav: командата не е открита
tao2wav: 命令找不到
tao2wav: コマンドが見つかりません