Power-on confirmed, tape playback, stop, fast forward/rewind, various line inputs, volume, PAN, EQ, and tape speed change were all confirmed. During tape playback, there is noise in the line input audio, and there is also a difference in volume between left and right channels. I only have a tape with a broken tab, so I haven't been able to confirm the REC operation. Please understand that this is being sold as junk. This is a CMX100 III S, a multi-track recorder equipped with dual-speed transport and DBX noise reduction, and a graphic equalizer. - Model Name: CMX100 III S - Features: Dual-speed transport - Noise Reduction: DBX noise reduction system - Equalizer: Graphic equalizer - Connection Terminals: RCA terminals - Tape Type: Cassette tape Included accessories: Power cable Thank you for viewing.