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To get the audio from the analogue inputs to outputs 1 and 2, nodes 80 and 89

need to be set:

./ xmos_mixer --set - value 0 80 0

./ xmos_mixer --set - value 0 89 0

At the same time, the original mixer outputs can be muted:

./ xmos_mixer --set - value 0 0 - inf

./ xmos_mixer --set - value 0 9 - inf

Now audio inputs on analogue 1/2 should be heard on outputs 1/2.

As mentioned above, the ﬂexibility of the mixer is such that there will be multiple

ways to create a particular mix. Another option to create the same routing would be

to change the mixer sources such that mixer 1/2 outputs come from the analogue

inputs.

To demonstrate this, ﬁrstly undo the changes above:

./ xmos_mixer --set - value 0 80 - inf

./ xmos_mixer --set - value 0 89 - inf

./ xmos_mixer --set - value 0 0 0

./ xmos_mixer --set - value 0 9 0

The mixer should now have the default values. The sources for mixer 1/2 can now

be changed:

./ xmos_mixer --set - mixer - source 0 0 10

./ xmos_mixer --set - mixer - source 0 1 11

If you rerun:

./ xmos_mixer --display - mixer - nodes 0

the ﬁrst column now has AUD - Analogue 1 and 2 rather than DAW - Analogue 1

and 2 conﬁrming the new mapping. Again, by playing audio into analogue inputs

1/2 this can be heard looped through to analogue outputs 1/2.

3.10 S/PDIF Transmit

XS1 devices can support S/PDIF transmit up to 192kHz. The S/PDIF transmitter

uses a lookup table to encode the audio data. It receives samples from the Audio

core two at a time, one for each channel. For each sample, it performs a lookup on

each byte, generating 16 bits of encoded data which it outputs to the port.

S/PDIF sends data in frames, each containing 192 samples of the left and right

channels.

REV 6.1

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