alsaloop: 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 CentOS possible default full paths are:

/usr/bin/alsaloop - from package: alsa-utils

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/alsaloop - from package: alsa-utils

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

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