soundmodem: 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/sbin/soundmodem - from package: soundmodem

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

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