I am in search of a program that would allow me to use my Mac (Pismo or G4 Sawtooth) to do audio recordings for a radio broadcast (onto cassette tape). I would like to blend music into the background of voice at various volumes. Do i actually need a soundboard for something like this, or is there software that can accomplish this? How does one hook up to a basic stereo for the actual recording? Or, would I do it all on my drive and then somehow upload it to a cassette recorder? As you can tell, I am new to Mac recording. Any cheap but good shareware programs out there that you recommend?