audiopreview: 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/audiopreview - from package: audiopreview

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

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