Use a mixer....I use a small mixer[Alesis multimix 6fx] for my small set ups..It sits on my keyboard, and gives me control right in front of me...I can blend the laptop[MP3's], my keyboard and a couple of mics[with effects]...You never know when you have to adjust volume and EQ thru the job..This is one thing that is not worth the short cut...One AC plug and two more cords!!!