The Tascam DP-004 Digital 4-Track Recorder is a modern version of the classic cassette Portastudios from Tascam. It features four CD-quality tracks and advanced functions like Undo and Repeat. The recorder has two 1/4 mic/line inputs, a switchable guitar input, headphone/line output, and a USB 2 connector for connecting to a computer. It records to SD Card media and can be powered by 4 AA batteries or an optional power adapter. The recorder also has features like autopunch, bounce, track editing, and mixing capabilities. Users can transfer their recordings to a computer for CD burning or online sharing.