Currently the hardware for CSP1 has three DACs, one feeds the RCAs, one
XLR+ and one XLR-. The same data gets sent to the RCA and XLR+ DACs,
there is a hardware inversion on the way to the XLR- DAC. There is no
provision for a user selectable inversion on the DATA stream. It COULD
be done, but the board is already designed. Then there is how the user
makes the selection. You can put a switch on the box itself. Or it can
come from software. If it's software we have to take another signal off
the processor into the carrier board. It certainly can be done, but it's
again a change to the current implementation.

Then the software has to be written to flip that output pin of the
processor. 

It would probably be easier to implement it in software. But that is up
to Triode and JackOfAll.

The off the shelf approach is to make an adapter to take single ended
signals off the XLRs, selects either the + or - outputs. 

John S.


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