Okay, I'm looking at buying a 4-track to get down some ideas on tape. I'm dirt poor for the time being, so I need one that's under $150ish. I'm not looking for anything fancy. Just something that's easy to use and sounds decent. Any recommendations? I've been looking at the Tascam MF-PO1. I've seen them around for about $80. Which brings me to another question...one of the differences between that Tascam and the next model up is the more expensive one has a Hi-Z guitar input. I know they both have 1/4 inch jacks, so what exactly is Hi-Z, and is it something that I need? Probably a stupid question, but I've looked around online and haven't found any explanations. Thanks.