on phones like the HTC Kaiser or Raphael if you use a phone call recording software like Vito Audio Notes Touch or Resco Audio Recorder the software record only the microphone device (it is in some countrys a law) - with this cab you can both devices record - the mic device and the audio out (phone) device. I think this cab change only(?!) any registry settings like
Code:
...
HKLM\Software\HTC\AUDIOGAIN\AUDIO_DEBUG_FLAG value="64"
HKLM\Drivers\BuiltIn\RIL\RingingAddressId value="0"
HKLM\Drivers\BuiltIn\WaveDev\VocRecPath value="2"
...
but I dont know if the settings goes back to the default if you deinstall the cap - better you make a backup

It's works perfect on my Touch Pro (without this cab I can only record my voice)....