Jacob Jovelou wrote: > > In other words - I want a 2 channel mix that not only contain 0,1,4 > (fronts and center) but also 5 (lfe). Oh, sorry, I completely misunderstood your problem then, it seems... I don't think that the -af filter layer can do what you want. I suppose you'd have to change the downmixing code instead. > > Regards, > Jacob