soundstretch: 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/soundstretch - from package: soundtouch

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

On Debian possible default full paths are:

/usr/bin/soundstretch - from package: soundstretch

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

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