sndfile-interleave: command not found

Have You tried accessing the binary with the full path?

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH

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/sndfile-interleave - from package: sndfile-programs

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