Next you configure the Audio / Primary settings. You can setup the Center Frequency here - see Fig 4. Next step is to select Setup menu from the top and General / Hardware Config. Main window of PowerSDR software should come up. window and select "Use" button on the right. You can add SoftRock 40 legacy radio - no need to add anything on Serial Number field.
When you start PowerSDR without turning Flex3000 on first it will pop up a window - note the button "Add Legacy Radios" below. Next step was to configure PowerSDR properly. below - don't use the pink microphone input jack. Using a normal male-to-male 3.5 stereo audio cord I connected KX3 to my home brew computer Line Interface ( Light Blue connector in ASUS P8Z68-V PRO/GEN3 motherboard as shown in the ASUS P8Z68 Manual ). A quick visit to Radio Shack was required as I did not have a 2.5 mm to 3.5 mm stereo Y-adapter (part 274-945). The first step was to connect the Elecraft KX3 RX I/Q interface to a sound card in the computer. Note that I am using PowerSDR version v2.4.4 on Windows 7. This turned out to be a fairly simple configuration - in fact you can run multiple instances of PowerSDR connected to different radios simultaneously. I wanted to see how KX3 would work with my Flex3000 / PowerSDR setup. While HDSDR is an excellent piece of software I am more familiar with PowerSDR as I have used it over 2 years. I have played with HDSDR and Elecraft KX3 for a while.
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