sidcon: 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/sidcon - from package: sidplay-base

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