[LAU] splitting headphones output

Hi I have a technical question that's not directly related to linux, but my laptop (which is involved) is running debian and for this purpose csound... I'd like to have an ultra easy setup with my laptop/csound and three usb keyboards. Normally I drag three hardware keyboards, an external mixer and my two roland cube amps. The onboard soundcard in the laptop is good enough to be used in most situations, so I'm thinking: what would happen, hardware wise, if I split the mini-jack output of my laptop into two, one going to in-ears monitors, the other going to the PA? I expect the output level will be lower, but can it damage the laptop headphones amp, that's driving the mini-jack output? -- peace, love & harmony Atte http://atte.dk | http://myspace.com/attejensen http://anagrammer.dk | http://modlys.dk