Easy thing to do would prolly be use a general purpose transistor MPS2222 (prolly need something larger that can handel around an amp or two) for example to connect the 12v to a 12V Relay to turn on the neons... I would say you would need to so the same for the amplifier remote switch... I will have to look into this myself as I will need it.. If anyone can elaborate on my idea or share there design or idea please do
Here is a link to the
.NET Framework 1.1 Redistributable Package that Microsoft offers...