can you try the following to find out whether the channel map is cooect
speaker-test -c6 -t wav -d -D surround51: Megalodon speaker-test -c8 -t wav -d -D surround71: Megalodon speaker-test -c6 -t wav -d -D hw: Megalodon speaker-test -c8 -t wav -d -D hw: Megalodon speaker-test -c2 -t wav -d -D pulse speaker-test -c6 -t wav -d -D pulse speaker-test -c8 -t wav -d -D pulse -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1184025 Title: [USB-Audio - Razer Megalodon, playback] Underruns, dropouts or crackling sound To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/1184025/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs