Just a guess that a Radar type system is WAY beyond your means at the moment. I'm going to go ahead and assume you have a computer if you're posting on the internet? There are tons of cheap usb interfaces, Reaper is ultra cheap, ez drummer is ultra cheap. There are free guitar sims. That's the safest route man. I used to record through one of the Boss hard disk recorders. Can't remember the model. It sucked. A modest investment in a computer based setup will be much easier to deal with.