zita-retune: 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/zita-retune - from package: zita-resampler

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