▲東亞第一高峰▲

http://alsa.opensrc.org/index.php/Ice1724#M-Audio_Revolution_7.1_.28Gentoo.2C_Ubuntu_6.06.29

M-Audio Revolution 7.1 (Ubuntu 8.04)

.asoundrc to fix surround71 bindings, and duplicate front channel through all other channels in a stereo configuration by default:

# 8 channel dmix
pcm.!surround71 {
    type dmix
    ipc_key 1024
    ipc_key_add_uid false
    ipc_perm 0660
    slave {
        pcm "hw:0,0"
        rate 48000
        channels 8
        period_time 0
        period_size 1024
        buffer_time 0
        # prevent stutter at 48000
        buffer_size 8192
        # alternately lower to 44100 and keep the buffer low
        #rate 44100
        #buffer_size 5120
    }
    bindings {
        0 1   # front left
        1 0   # front right
        2 6   # rear left
        3 7   # rear right
        4 2   # center
        5 3   # lfe
        6 4   # side left
        7 5   # side right
    }
}
# perform upmixing
pcm.ch71dup {
    type route
    slave.pcm surround71
    slave.channels 8
    ttable {
        0.0 1     # front right
        1.1 1     # front left
        0.2 1     # rear left
        1.3 1     # rear right
        0.4 0.5   # right channel to centre 0.5 gain
        1.4 0.5   # left channel to centre 0.5 gain
        0.5 0.5   # right channel to lfe 0.5 gain
        1.5 0.5   # left channel to lfe 0.5 gain
        0.6 1     # side left
        1.7 1     # side right
    }
}
pcm.duplex {
    type asym
    playback.pcm "ch71dup" # upmix first
    capture.pcm "hw:0"
}
# change default device
pcm.!default {
    type plug
    slave.pcm "duplex"
}
# for aoss
pcm.dsp "duplex"
pcm.dsp1 "duplex"