With the Hauppauge Tweak Tool several advanced settings can be changed that are not accesible with the normal software.
There are four sections:
"Wintv2k" contains settings for wintv2k (the hauppauge software). These settings can apply to several models
"250/350" contains settings specifically for the pvr 250 and 350 cards. Some of the settings only affect wintv2k, but most affect some third party software as well
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"150/500" contains settings specifically for the pvr 150 and 500 cards. Some of the settings only affect wintv2k, but most affect some third party software as well.
"150/500 advanced" contains more 150/500 setting, advanced settings as temporal/spatial filtering (Motion blur) can be found here. Some of the settings only affect wintv2k, but most affect some third party software as well.
Usage: Change the value of the setting(s) to the desired level, select the checkbox next to it (in the save setting column). And press the "save setting" button. Details on settings are displayed on the right info box, as soon as you select an setting.