As a superuser, add to /etc/portage/repos.conf/gentoo.conf the following:
[dimibyte]
location = /var/db/git/dimibyte
sync-type = git
sync-uri = https://github.com/dimibyte/gentoo-overlay.git
Using topic materials, bugfix for:
$ alsamixer -D equal
ALSA lib ctl_equal.c:289:(_snd_ctl_equal_open) Problem with control file .alsaequal.bin.
cannot open mixer: Operation not permitted
Some notes about configuration can be found here.
Using ABI 10305 (1.3.5)