vorbisgain: 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/vorbisgain - from package: vorbisgain

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

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