Currently I have (and love) my Marantz PMD-671 field recorder. It does everything I want, BUT it only records two channels at a time. Is there anything with a feature set similar to the PMD-671 (24/96 PCM recording, clean preamps, etc), but which records more tracks? The Tascam DR-680 LOOKED like it would be great, but from what I can tell from the online manual, it doesn't seem to recharge batteries when plugged in to AC. That seems like it would be a huge inconvenience.