We just released a product that allows to do what you want - raise volume level above maximum in real-time. It works for any PC program boosting its sound to the level you want. Check it out - Sound Booster
How can I increase or boost my PC volume above the maximum allowed?
My speakers/headphones have no external volume control and the PC's volume control settings are already maxxed out.
This is for streaming audio, so I can't use audio editing software to convert it.
Can anyone recommend a software device driver that can boost PC volume in real-time?
This is for Windows XP.