Will the soundcard on the 6700 allow you to send and receive SSTV

Yes, it's a simple matter of configuring the SSTV software with SSDR software.

Just to be clear Thurman,

There is not a sound card per say in the 6700.  There is software that runs on the PC under Windows called DAX which stands for Digital Audio eXchange.

This software installs multiple sound cards in your computer. Each one can receive digital audio from one of your 6700 slices.

So the chain is:

6700 -> TCP Network -> DAX (running on windows computer) -> Dax RX 1 Audio soundcard

Then in your SSTV software you point the incoming sound card at the Dax soundcard for your SSTV slice.   You put the transmit from SSTV software to Dax TX Audio.  This will send audio to the radio.

The beauty of this setup is the audio remains digital the entire way and in both directions.

For keying and rig control there is another program called CAT (Smart CAT) that can present network ports, COM ports so that your SSTV program can key the radio.

It really is very easy.