tonetrain: 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/tonetrain - from package: vpb-utils

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

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