I purchased this item used and have used it a few times at home and in the studio. It's normal for the knobs to make a crackling sound when turned. The original box and papers are included in the photos, but they are folded and worn, so please consider them for shipping purposes only. Please refrain from complaints regarding the condition of the box and papers. There are scratches and stains, but the item has been tested and is in working order. I generally won't respond to price negotiations, but I will consider them if you write them, and I'll use them as a reference if I decide to lower the price. Shipping will take 4-7 days, but I will ship it as quickly as possible if I have free time. Instant purchase is okay, even if there are comments.