SkyMonkey
The card is a SIIG DP FireWire 2-Port PCie part number NN-E20012-S2. In device manager the card is present and is working. I have tried legacy driver and that just made windows media player not even try to play songs ( this has been the most convenient way to do a quick check, with ti driver WMP attempts to play tracks but no sound i.e song progress bar, no sound).
The saffire has all 3 lights lit.
OK, this is the exact same card that I am looking to buy! It is in my vested interest to ensure this card works for you, and in turn works for me in the future (have not bought yet)!
Three lights lit means that the Saffire should be connected and operable. I have the Pro 24 (non-DSP), but I would assume they both operate the same.
Per Focusrite, the legacy Firewire drivers were not required with MixControl 3.0 and later updates. We're now on v3.2, I believe. If drivers are available from Siig's website for the NN20012 card, and Win7 doesn't auto-find and load the correct ones, I would assume the Texas Instruments 1394 OHCI Compliant Host Controller (as displayed in the Device Manager) is the correct one.
Speaking of MixControl, make sure everything is still adjusted and OK in there too, i.e. main volume knob to 0dB, no mutes enabled, applicable monitors turned on (the 6 square buttons on the right--mine are all blue), monitor outputs configured correctly (DAW1, DAW2 to Monitor Outputs 1, 2, etc.). Also, make sure both the Saffire's sample rate
and Windows sample rate are the same. I use 48kHz because of ADAT-sync, so I must configure Windows the same way to play audio outside of Sonar. Therefore, go to Playback Devices (right-click Windows volume icon) and go to the Advanced tab. Set the Default Format to 44.1kHz, 48kHz, or 96kHz depending on your setup. Click the test button. Hopefully you hear the chimes. Do the same for recording devices.
*** I don't fully understand how this works, because even high sample rates will play back (interpolated?), but I seem to have less issues if the Windows sample rate is set up to be the "native" sample rate of the Saffire. Otherwise, when opening up various audio applications outside of Sonar, e.g. Sound Forge, the Saffire will temporarily lose its connection until the time I click the record button in said application. ***
SkyMonkey
The issue with Hot Plugging. Do I have to power down the whole system to avoid hot plugging or can I just use the power switch on the back of the saffire and switch plugs then.
I don't know if I believe in the whole hot-plugging-causes-damage thing. I'm sure older equipment and cards were that way, but newer cards adhering to the IEEE spec should be OK. With the camcorders I've used in the past, and even the Saffire to this day, I've never had a problem. However, err on the side of caution. The switch on the back should work, but upon subsequent reconnect and power up, just ensure all three lights are ON. If so, that should mean it's connected and operating. To be doubly-sure, however, I would just restart the computer after a connection to ensure it's OK and working properly.
You may want to download an application called DPC Latency Checker to see if somehow, some way this new card isn't causing a crippling latency that is not allowing audio to pass through. When running DPC Latency Checker, the bars in the graph should be small and green. Try it when idle and when playing audio (iTunes, WMP, etc).