For my current project I need a under 150€ multichannel Soundcard with 6 outputs and one input (line or mic). I already testet two link1, link2) the latter has a better signal to noise ration, but both share one problem: The Inputs and Outputs show up as two different devices on raspberry and do not sync in the soundcard itself.

So two questions:

1. Can anyone recommend a suitable audio interface for under 150€, that connects as one device for input and output available in Germany?

2. Does anyone have recommendations to create a stable and reliable(!) aggregate device on raspberry to sync input and output on software side?

Thanks for any tips and thoughts!

Cheers,

Martin