VEMURAM Jan Ray ADD CBF edition. By turning the knob on the bottom, you can adjust the low-pass filter and the original sound mix, making it easier to create the desired sound. While there are some minor signs of use when held up to the light, it's in beautiful condition with no noticeable stains. Operation is smooth and there are no particular issues. Accessories include the instruction manual, sticker, and trim driver. This ADD CBF edition is not often seen on flea market sites, so how about taking this opportunity? Thank you.