AlsaEqual for multiroom configuration

I try to use AlsaEqual under Ubuntu.
All the packages seem correctly installed.
I have one 7.1 card configured to output 4*stereo channels (multiroom system).
Each channel use a squeezelite and I output directly to the alsa channel.

I can access the sound mixer using

sudo alsamixer -D equal

I only need one equalizer for all the 4squeezelite (running as root service). I am unable to configure the equalizer

My alsa config is the following:

ctl.equal {
        type equal;
}

pcm_slave.eightchannels {
        pcm "hw:0,0"
         period_time 0
                period_size 1048
                buffer_size 32768
                rate 48000
        channels 8
}

pcm.pool{
        type plug
        slave.pcm {
                type dshare
                ipc_key 87882222
                slave eightchannels
                bindings [ 2 3 ]
        }
}

pcm.bedroom{
        type plug
        slave.pcm {
                type dshare
                ipc_key 87882222
                slave eightchannels
                bindings [ 4 5 ]
        }
}

Thank you.