alsa_out: 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/alsa_out - from package: jackd1
/usr/bin/alsa_out - from package: jackd2

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