Instruction: First, identify the target attributes from the provided list. Then, scan the product title, description, feature, and brand to extract the values associated with each target attribute. Finally, create a list of dictionaries, each containing the extracted attribute, its corresponding value, and the source where it was found.

Input:
Product title: Yamaha RX-V861BL 7.1-Channel XM-Ready Home Theater Receiver (Discontinued by Manufacturer)
Product description: Yamaha 7.1 Channel Digital Home Theater Receiver combines the latest and the best technologies, parts and circuit design to maximize sound quality. It features dual HDMI inputs and one output that supports 1080p resolution enabling users to connect two HDMI sources. The four SCENE buttons make operating the receiver easier than ever. The popular CINEMA DSP programs have been upgraded for this receiver which delivers awesome sound with the latest game machines.
Product feature: 7-channel 735W powerful surround sound (105W x 7), 2 Zone/2 Source Receiver, 4 SCENE buttons on front panel and remote unit offering easier operation, High-definition video upscaling (480i or 480p to 720p/1080i), iPod compatibility via optional Yamaha YDS-10, XM Ready with XM HD Surround powered by Neural Surround
Product brand: Yamaha Audio
Target attributes: Number of Channels
Answer: attribute: number of channels
value: 7.1-channel
source: product title
attribute: number of channels
value: 7.1 channel
source: product description