Yes I have a scope and will run tests for you when I get back to my desk. 

Sent from my iPhone

> On Jul 4, 2015, at 11:15 AM, [email protected] wrote:
> 
> Colin,
> 
> That would be phenomenally helpful!  Do you have a scope?
> 
> I'm curious if you see any life on pin 28 of the P9 header with and without a 
> cape.  I suspect you will see data with the cape (because the DAC on the cape 
> board is talking to the BBB's processor), but nothing without it.
> 
> I unfortunately don't have a way to "fake" the cape. 
> 
> 
> 
>> On Saturday, July 4, 2015 at 9:23:59 AM UTC-6, Colin Bester wrote:
>> If it'd help I could run same tests for you with and without audio cape and 
>> test the theory - I am running bone68 but suspect results will be the same - 
>> it'd be good to know if you can see output or not.
>> 
>>> On Saturday, July 4, 2015 at 10:19:59 AM UTC-5, [email protected] wrote:
>>> 
>>> Latest thoughts on this: I think perhaps the problem is that I should not 
>>> expect to see serial data from P9_28 (I2S serial data out) without an 
>>> actual Audio Cape.  There are probably I2C (control) and I2S (audio 
>>> content) requirements, such as clocks and so forth, that are required 
>>> before the BBB will output data.
>>> 
>>> Unfortunately, I know virtually nothing about hardware.  
>>> 
>>> I would just buy an Audio Cape, but I have not seen them in stock anywhere 
>>> for the past month, and there seems to be no indication of when they'll be 
>>> available again.
> 
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