playitslowly: 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/playitslowly - from package: playitslowly

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

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