Hi T!,
Thanks for the response. I am using an sdr-iq radio and the SDR Console from SDR-Radio.com. I am also trying to use the Virtual Audio Cable and trying to decode HF fax live using the image viewer from the SDR Console from SDR-Radio.com. I cannot seem to get it working, but there are many different setting and I have tried many different settings and have not gotten it to work. I will try the enable the Wave Out sound output as your windows recording device. Does this mean that you must record the file and then play it back to get the image, or can it be done live?
This is very hard to troubleshoot as this depends on how your audio drivers (the soundcard) sets up the various (driver-based) audio components. You also didn't mention what version of Windows operating system you're using. This can make a difference.
Basically, you'll need to go into Control Panel -> Sound and play around with your audio defaults.
VAC works by mapping a "virtual" connection to your audio out but this doesn't always work. It depends on how the application outputs the audio.
A prime example for myself is the way the Perseus and HDSDR applications output their audio. VAC will not recognize the audio output from HDSDR without changing settings -- whereas VAC works great with the Perseus by default.
Obviously, your HF-FAX software needs to be configured properly. It needs its INPUT set to the Line 1 VAC input.
If you have a newer computer, then be sure to download the latest sound card drivers.
Be sure to check your Start Menu -> Applications for a VAC folder. There is a "VAC Control Panel" application that may need some adjustments.
I highly recommend going to the VAC web site and reading the online documentation. (There's also a user manual under the VAC Start Menu folder.)