rplaydsp: 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/rplaydsp - from package: rplay-client

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

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