This is a Gemini CDM-3600. All knobs are present. No noticeable crackling. Although it's an old model, it was mainly used as an analog mixer, so the CD player wasn't used very often. I've confirmed it can read both left and right CD-Rs. The main functions and inputs/outputs have been confirmed. The fader knobs are not original. The pitch slider on the right and the center fader have had internal parts replaced. The original pitch slider had a center click, making it easy to stop at +/-0, but the replacement parts do not have a center click. Therefore, it's not easy to instantly set it to 0, but you can press the pitch button to return to 0, so it wasn't much of an issue, but please refrain from purchasing if you are concerned. There are scratches and dirt. We will accept returns for any defects found during inspection, but there may be condensation at this time of year, so please let it acclimate to room temperature for a while after arrival before checking.