This suggests a bizarre mechanical problem with the iPad or cables (i.e., not a C5D issue, despite the ODAC report). Do you have another iPad or iPhone you can try?
Digital audio output from an iDevice works identically to OS X, Windows, etc: The operating system detects the USB device and begins transmitting digital audio data. To C5D, there's no difference whether the audio source is a phone, tablet, or computer. It's either receiving data or it is not. Thus, when C5D works perfectly on a computer, it should also work perfectly on a supported tablet or phone. More info here:
http://blog.jdslabs.com/?p=838
Two or three users since C5D's release have reported unexpected results. In all three cases, it was caused by a damaged Lightning jack on the iPad or iPhone (cable made power contact, but not digital contact). In each case, C5D of course tested normally at JDS Labs and not for the customer.
@r010159: You're welcome to send your C5D in again. We'll re-test for normal behavior under Win7, OS X, iPhone 4S, iPhone 5S, and latest gen iPad. Please note the above first.
It is not the hub. The hub works with the O2/ODAC. So does the lightening adapter used as part of the chain of cables. The lightening adapter apparently also works without the hub. When I tested with the C5D hooked up to an iPhone through the hub it also did not work. This should eliminate everything but the C5D. However, when I hooked up the iPhone to the C5D using a 30-pin CCK adapter, it
reliably worked. So there is a problem with both the hub and the adapter. The hub does work with the Mac computer that I have, so apparently when the hub is powered by an iDevice, it does not work. This should not be a problem since the C5D does not get its power from the USB bus. No wonder this was confusing to me!
It looks like there is a problem with the new Lightening adapter which is an genuine Apple CCK adapter purchased from Amazon. And it does work from time to time. It worked more often in the past than it has now. This is one of the rare instances of an intermittent problem turning out to be an adapter. So as this epic journey continues, I will order another one from Amazon. But the last purchase was from a third-party on Amazon. Perhaps it would be better if I purchased it locally from an Apple store? I think I will do this next.
EDIT: I came back to this afterwards to find the same problem again. When it does work, all I need to do is turn the C5D off then on and no music again. By only toggling the power button I can get it to work. This happens with a different USB cable, and with my iPhone this time which does not use the lightening adapter. But when I unplug the cable a few times, it can start to work.
Does this mean a USB controller not initializing properly when an iDevice is being used?
Bob Graham
[message to jseaber deleted]