How to solve usb dac sound intermittent

    Hi ,my tv box is s905 installed LE,and install mpd add-ons ,I'am using usb dac aune x1s it's can play ,but the sound intermittent.I broswer other thread,

    say

    Edit the file "/etc/security/limits.conf" and add the following lines

    How to edit it on LE ?

    Code
    @audio - rtprio 99
@audio - memlock unlimited
@audio - nice -10

    I solved it.

    1.SET CPU frequency scaling

    Code
    #append to ~/.config/autostart.sh
 echo performance | tee /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor >/dev/null

    2.Tuning USB devices for minimal latencies

    use the module configuration line (e.g. in ~/.config/modprobe/modprobe.conf):

    options snd-usb-audio nrpacks=1