csb64enc: 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
/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/bin/csb64enc - from package: csound-utils

You may install the required package with command apt-get install {package}
Error in other languages:
csb64enc: bevel nie gevind nie
csb64enc: comandă negăsită
csb64enc: comando não encontrado
csb64enc: commande introuvable
csb64enc: command not found
csb64enc: käsku ei ole
csb64enc: không tìm thấy lệnh
csb64enc: komanda nerasta
csb64enc: Kommando nicht gefunden.
csb64enc: kommandot finns inte
csb64enc: komut yok
csb64enc: nie znaleziono polecenia
csb64enc: níor aimsíodh an t-ordú
csb64enc: no se encontró la orden
csb64enc: no s'ha trobat l'ordre
csb64enc: opdracht niet gevonden
csb64enc: parancs nem található
csb64enc: perintah tidak ditemukan
csb64enc: príkaz nenájdený
csb64enc: příkaz nenalezen
csb64enc: команда не найдена
csb64enc: командата не е открита
csb64enc: 命令找不到
csb64enc: コマンドが見つかりません