GroovyMAME display setting help

[zxthehedgehog]

So, I'm using GroovyMAME with my monitor, which is a Panasonic DT-2730MS CRT, with a PC with a Nvidia Geforce 9400 (I can't use an ATI with my computer for technical reasons) connected using Powerstrip. My problem is that when I choose a mode to load, it either flickers, shows visual garbage, crops out some of the game, does weird resizing to 3D games, or has off-pitch sound (sound is much higher pitch than it should be, only happens in some games, mainly NeoGeo and CPS3). I probably need to configure a custom video mode, but I can't make much of the documentation (it entirely lost me at front and back porch -   ). I would really like some help.

The link below has the specs for this monitor, if anyone is willing to help me figure this out.
----------------------------------------------------------------------------------------------
http://www.broadcaststore.com/store/model_detail.cfm?id=779516

[Calamity]

Hi zxthehedgehog,

Are you sure that the Geforce 9400 is fully supported by Powerstrip? (just asking, I'm not well informed about Nvidia cards).

If it is, the only problems you might find are geometry issues, the ones that can actually get fixed using different porch settings.

Visual garbage that doesn't lasts longer than an instant indicates that Powerstrip is failing configuring the video card. A wrong sound pitch means GM thinks it has successfully set a certain refresh rate by means of Powerstrip, when the reality is that the refresh change failed.

Not all hope is lost. If you manage to edit the existing modes through the Powerstrip built-in UI, I mean *manually*, then you can port the corresponding timings from Powerstrip to an .ini file for a specific MAME game. Look for the typical clipboard icons in the advanced timings menu.

Although this is possible and supported for your convenience I don't know anybody that's actually using this method today. People end up buying a supported ATI card.