3 months ago I purchased a DigiTech GSP5 online from GC. It arrived on time and shipped well. Upon finding a power cable they did not provide, I discovered that the clock battery was shot. No big deal, $3 and ten mins I had that in. Annoyed, I moved on getting the equipment into my rack expecting to use it for modulation more than anything. Well, it emits a squeal and horrible noise on every setting. It just does not work. I contacted GC and was promised a refund, they were sending a label to me to send the item back. After several emails, I still do not have my refund. No label. And a boat anchor in my rack. Suffice it to say I will not buy another thing from them again. GC. NF. Never again for used equipment.