raw_to_xgraph: command not found

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/raw_to_xgraph - from package: speech-tools

You may install the required package with command apt-get install {package}

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