[Jack-Devel] Jack Problems

[liebrecht at grossmann-venter.com]

Holger Marzen wrote:

> I don't know if and how SPDIF-input appears in jackd and if it has to 
> be
> routed IN the interface by some magic platform-dependent software.
> I'd test the analog inputs first since they are connected to mixbus.
> 

I sorted everything out, there is nothing that do not work 
pulseaudio/jack/bluetooth/all desktop sound and I can now route as i 
wish with patchage. Very nice.

I can now focus on spdif.
My keyboard is connected to the 1818 via a direct spdif link. I can use 
the easy midi connections but I prefer spdif. Always had great results 
with it live.

I know that spdif is always routed to the channels 9&10 on 1818vsl.
Somehow though mixbus sees absolutely no signal on 9&10 and I made sure 
that all alsa capture volume settings are maximum. All other inputs are 
successfully routed to mixbus and I get a signal.

I am just a bit baffled about why it suddenly does not work. All spdif 
sync signals are handled between 1818vsl and the keyboard, so that 
cannot be the problem unless alsa for some reason need them, but I 
cannot see why. It must be the case as mixbus seemingly have timing 
ports. My understanding is that I do not need mtc/ltc for any spdif 
signal to at least appear in mixbus as a precondition, neither does 
1818vsl seemingly forward the clock through usb. If it is alsa seemingly 
do not recognize it.
all I can think of is that there is an alsa error muting channels 9&10. 
They are clearly connected correctly by jack.

See attached graphic
http://grossmann-venter.com/issues/jack/routes.png