I have Xonar D1 with Windows 7 x64 using Sound Forge 9.0e to capture audio from Line Level inputs (LPs played on stereo system).
The recording level maxes at -12Db to -15Db. This of course artificially restricts the dynamic range. All settings are maxed in the Xonar D1 control panel as well as the Windows Sound control panel.
This problem has beem reported by others on the internet with Xonar cards.
I have searched and tried many things suggested. None have worked.