Into Keyboards And Used As Amplifiers? I'm looking to find out whether the above listed product, which can be found at: http://www.imuso.co.uk/ProductDetail.asp?StockCode=EG01627 can be plugged into keyboards, specifically the Yamaha Tyros 3 and Technics SX-KN7000 and the keyboard be used as an amplifier output for the headset.

Also, does anyone know of a better price, (£GBP), from a UK-based stockist?

This is sort of like 2 questions in one, so I'll base my BEST ANSWER, based on what is overall more informative and helpful, thanks.