envy24control: 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/envy24control - from package: alsa-tools-gui

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

Error in other languages:
envy24control: bevel nie gevind nie
envy24control: comandă negăsită
envy24control: comando não encontrado
envy24control: commande introuvable
envy24control: command not found
envy24control: käsku ei ole
envy24control: không tìm thấy lệnh
envy24control: komanda nerasta
envy24control: Kommando nicht gefunden.
envy24control: kommandot finns inte
envy24control: komut yok
envy24control: nie znaleziono polecenia
envy24control: níor aimsíodh an t-ordú
envy24control: no se encontró la orden
envy24control: no s'ha trobat l'ordre
envy24control: opdracht niet gevonden
envy24control: parancs nem található
envy24control: perintah tidak ditemukan
envy24control: príkaz nenájdený
envy24control: příkaz nenalezen
envy24control: команда не найдена
envy24control: командата не е открита
envy24control: 命令找不到
envy24control: コマンドが見つかりません