sndfile-play: 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/sndfile-play - from package: libsndfile

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

On Debian possible default full paths are:

/usr/bin/sndfile-play - from package: sndfile-programs

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

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