adplay: 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/adplay - from package: adplay

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

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