You assume such step-by-step instructions exist?
You are asking about an application that is outside mainstream. Something not many people will do. The fewer people who do it the less likely the task will be well documented. Further, you are asking specifics to your receiver (of course the receiver type matters not), further reducing the likelihood someone will have exactly the answer you want. That really is not the way these things work most of the time.
Thunderknight responded with basically what you want. The answer that it can, and is, done with a Pi and the name of the specific script he uses to do it. A quick Google search on that name turns up a page with instructions on how to use / configure for that operation (
https://sites.google.com/site/glyman3home/radiosave ). It is not a step-by-step of how to hook it to your radio, and assumes some level of knowledge.
But I bet it is as close as you will find.
T!