lpc_export: 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 Debian possible default full paths are:

/usr/bin/lpc_export - from package: csound-utils

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

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