Setting multiple audio interfaces with Jack2 (help!)

[korakios]

Hi,
I have a usb audio interface and the onboard card of my laptop. For technical reasons I want to use both interfaces using Jack2.
What I did and din not work:
Set on Jack2 default interface the usb
Launched alsa bridge
Launched Reaper and play a loop. Sound coming from the usb interface as expected.
Launched Catia and connected Reaper Out to Jack2Alsa. No sound from the onboard.

What am I doing wrong?

[tatch]

that's not really possible, you can only use one interface as an input and one as an output.

[korakios]

@tatch
It is possible.Just did it after hours searching
I installed zita-ajbridge but I though it was only for jack1. BUT if choose in Cadence the bridge tool zita instead of alsa it works!
Now the question is why alsa bridge tool is not working by default?

[hellalive]

I used to do this but the clock between the 2 cards used to shift after some time causing glitching so I stopped. I wouldn't reccomend it

[korakios]

To be honest I didn't test this enough.Maybe if an onboard card has spdif out and a pci card like maudio2496 has digital in slave clock ability ,maybe there is a chance.

[bazsound]

To be honest I didn't test this enough.Maybe if an onboard card has spdif out and a pci card like maudio2496 has digital in slave clock ability ,maybe there is a chance.

This sounds like a better option since theres more chance of better sync.

Running 2 different interfaces can be troublesome due to differences in latency and jack may not be able to compensate correctly for them. It can be made to work but its not recomended.

for professional audio work running more than 1 interface is usually done with firewire interfaces using lightpipe to get additional inputs.The first interface usually supports twice as many inputs as physical inputs and you slave up a 2nd interface via lightpipe and connect them via wordclock