am7xxx-play: 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/am7xxx-play - from package: libam7xxx0.1-bin

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

Error in other languages:
am7xxx-play: bevel nie gevind nie
am7xxx-play: comandă negăsită
am7xxx-play: comando não encontrado
am7xxx-play: commande introuvable
am7xxx-play: command not found
am7xxx-play: käsku ei ole
am7xxx-play: không tìm thấy lệnh
am7xxx-play: komanda nerasta
am7xxx-play: Kommando nicht gefunden.
am7xxx-play: kommandot finns inte
am7xxx-play: komut yok
am7xxx-play: nie znaleziono polecenia
am7xxx-play: níor aimsíodh an t-ordú
am7xxx-play: no se encontró la orden
am7xxx-play: no s'ha trobat l'ordre
am7xxx-play: opdracht niet gevonden
am7xxx-play: parancs nem található
am7xxx-play: perintah tidak ditemukan
am7xxx-play: príkaz nenájdený
am7xxx-play: příkaz nenalezen
am7xxx-play: команда не найдена
am7xxx-play: командата не е открита
am7xxx-play: 命令找不到
am7xxx-play: コマンドが見つかりません