System Test / need for Instrument drivers ?

I want to use TestComplete for System Testing, to create a real E2E test of both SW and HW.

How have YOU done that ??

My user case example: 

- WIN GUI: Turn on a microphone from my application 

- Start a signal generator 1Khz 

- Setup some relay's to route the signal to the microphone

- WIN GUI: Check a indicator in the UI

So I need some instrument drivers from TestComplete (most new measuring instruments use LAN/USB or IEEE/GPIB) to control e.g.

 - Power supply

-  Signal generatior

-  Spectrum analyzer

-  Relays to route audio / RF signals

-  etc.

And as this isn't something new, I thought someone else allready been down that path...

Alternatively the control/measurement values, could maybe be fetched from the Instument GUI (if avaliable), but that is just a very secondary solution I think. Or maybe National Instgruments LabVIEW coule be usefull here?