Has anybody been interfaceing Netduinos to DAC's? Original version didn't have the SSC pins (PA21 - PA26) routed to any connectors, but the Netduino Plus seems to have connected most of the SSC / SPI1 pins to microSD card reader. So if you take the control of the SSC and configure it seems to be possible to connect to DAC or even CODEC (information from Atmel app notes claims that the input can only be monophonic). As you don't want to desolder the uSD card slot you could use special microCD extension cable connected to DAC board. Old TDA1545A is for an example one possible DAC and does not require special master clock (MCLK).
Connecting to audio DAC
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