[linux-audio-dev] how to mix various s/pdif sources?

hello, i would like to mix several (up to six) s/pdif sources in the digital domain. the problem is, that every source has its own clock and possibly different sample rate. is there any software that can open several non-synchronized sound cards at the same time? iirc there was a patch for jackd for drift compensation, but i cannot find it in anymore and i'm also not sure if that would help. Minidisc 44100.17 ==S/PDIF==> Sound Card 1 ==> Audio App \ \ Laptop 48000.23 ==S/PDIF==> Sound Card 2 ==> Audio App --> D/A (96khz) / DAT 48000.09 ==S/PDIF==> Sound Card 3 ==> Audio App /