Software to increase system-wide audio volume in Windows 7?

Hi all,

I currently have a VirtualBox VM (virtual machine) of Windows 7 Professional running on a host Windows 7 Ultimate, both 64-bit. I am in a situation where I am finding the audio output from my VM is simply too low in volume even with the VM Windows's volume set to maximum at 100%. While a simple answer would be to increase my host Windows's volume further (it's at 70%) and/or just crank up the volume on my speakers, this skews with the host system's volume where I have set everything perfectly where I want it.

So I am looking for a software-based alternative that can boost the volume of Windows's audio in the OS itself (inside the VM). Googling has only brought up the "answer" of turning on Loudness Equalization, which is inadequate for my needs as it introduces audio distortion and is not the exact answer to my problem at any rate.

While I will have to resort to the Loudness Equalisation thing if all else fails, I'm looking for something with a more refined approach. Does anyone know of a piece of software/driver that can, for example, serve as an equalizer or in-between filter that sits directly in Windows 7's audio subsystem, not unlike Realtek's equalizer on their HD Audio drivers?

For reference, the VirtualBox VM is emulating an Intel HD Audio sound card/chip. This can be changed to AC'97 or Soundblaster if required. This is also a virtualized environment if it wasn't clear already, so any concerns of blown speakers and hardware are not applicable short of something completely ridiculous.

Thanks to everyone for reading, and hopefully someone can enlighten me. :)