Kramer, there's no such thing as a 512mb Smart Media card. I think you don't really know anything about the Pandora. Record 2 tracks at a time? Basically, you don't, the Pandora can only record 2 tracks simultaneously in line in mode, through it's stereo minijack line in. This is not mic level, and you can't plug a guitar into it. If you care, the simplest solution is this.- get a small mixer, like a cheap Behringer Eurorack for about $80. You plug mic into channel 1, and guitar into an instrument jack. Pan them hard left and right, so the guitar, say, goes to the right RCA "tape out " jack, and the vocals go to the left "tape out" jack, and then from those 2 tape outs, a "y" connector(splitter) to a 1/8" stereo miniplug. You can use the same "y" connector to record stereo stuff from a CD player or cassette deck, radio, etc., which is what that jack was intended for on the Pandora.
I'm afraid that's the only way you can record 2 tracks simultaneously on a PXR4. It wasn't really built for that. You can get it to do it, but it requires a mixer. You could do it with a 2 channel preamp, but most preamps put out pro audio line level (+4), and the Pandora wants consumer line level (-10), and the tape outs on a mixer put out -10, because they're meant to go to a consumer level tape deck. Here's a plan, stop trying to make the PXR4 do stuff it wasn't built to do, and try using it for what it *was* meant to do, songwriting, 1 track at a time. Learning to do that will make you a better recording artist. Everybody wants to get out of playing and singing separately because it's work, it's *hard*. But in the end, if you want to be a recording artist, you *can't* get out of it, anymore than you can get out of reading that manual.- Good luck.-Richie