Hello Måns, thanks for your effort! I have the same opinion: mixing should be possible for a single input. Nevertheless be careful with your patch: one has to check whether other operations (like multiply) are still meaningful for a single input. I think so, but I have not looked deeply into that. Best regards, Thomas _______________________________________________ Sox-users mailing list Sox-users@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/sox-users