mpfade: command not found

Have You tried accessing the binary with the full path?

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/mpfade - from package: mpdtoys

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