Question : Amplifying sound going out of soundcard

Hi , I have downloaded some videoclips from the Internet . All of them works normally , and I use RealPlayer to playback them . But one fact that all of the sound is too small , I cannot get the voice bigger , though changed the Master Volume in Windows to maximum . Unfortunately , I dont use a sound speaker , only a headphone plugged to sound jack .
I dont know if those clips require codecs , havent informed anyways .
So , anyone knows software or something else that work alone , work the function that amplifying the sound going out sound jack , without changing the resources directly .I know some audio editor that can amplify but it change the resource .
Any recommendations , comments are welcome !
thanks for reading the ask .

Answer : Amplifying sound going out of soundcard

Nothing out on the right channel, as I said, doesn't mean mono; it means you're only getting *half the original sound. The original sound of most clips is stereo and you're only getting *half of it --

*not even half because vital information that is missing on the right chanel may not be emanating from the left channel.
There is no successful software in existance that can replace an audio amplifyer.
Get a set of amplified speakers, and stop trying to re-invent the wheel.