TS-7970 3.5mm Audio Ports

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The TS-7970 includes two 3.5mm jacks. The top port is a mono microphone input, and the bottom port is a headphone port with left and right channels.

In Linux you can select between the HDMI and 3.5mm ports with an alsa variable. By default all audio comes out of the sgtl5000 for the 3.5mm ports. 

# list the sound cards
aplay -l

export ALSA_CARD=imxhdmisoc
espeak this is playing from the HDMI monitor

export ALSA_CARD=imx6qts7970sgtl
espeak this is playing from the onboard sgtl5000
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