ecasound: 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/ecasound - from package: ecasound

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

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