Tascam DR-40X

In addition to normal stereo channel recording and Dual Recording mode, DR-40X has "4CH Mode" that can record two different stereo feeds simultaneously. The combination of the sources are flexible; recording the built-in microphones along with a pair of external Mics such as close-up and ambient microphones, or recording the built-in Mics along with a balanced line input such as the feed from a mixer along with the sound in the room.

Film-makers and videographers often experience sudden audio volume spikes during filming. An actor could suddenly scream, or a documentary subject could do almost anything.
DR-40X has a Dual Recording mode that captures a copy of your take but at a lower level, as a safety track in case of sudden distortion. Also, Auto recording function can detect the sound input signal level and automatically start recording. The Pre-recording function with up to 2 seconds pre-record provides fail-safe protection.

Peak Reduction works in rehearsal mode or in record. Even if the sound or performance is louder than the sound check you're safe. Combined with Auto level and Limiter for preventing distortion, you never have to worry.

If you don't like the last part of a phrase you just recorded with your guitar, or if you change your mind and want to rephrase narration, the "Overwrite mode" is exactly what you need. Overwrite mode allows punch-in recording from a desired point. It is destructive editing with one level of undo.

The overdubbing function allows for Overdub Recording while playing a previously recorded file. This allows you to record other parts such as a guitar solo over a recording previously made such as at a rehearsal studio. Overdubbing creates a new file, leaving the original file unaffected, making it easy to re-record.

DR-40X support a SDXC card, which can record longer with larger data capacity. If you record one stereo file in 44.1kHz/ 16bit CD quality, 128GB card holds 192 hours maximum. In MP3/ 320kbps, it can record up to 896 hours. (that is 37 days!).