Du kannst unter Hauptmenü --> Anpassen, AC3 als default setzen.
Ansonsten merkt sich e2 immer die letzte Audiospur für jeden Sender.

Was anderes is mir nicht bekannt.

in case moust of E2 developers are germans we dont have so much chances see that feature

i have wrote one script, but this wrong place - right one is closed source Enigma2 at read pmt
script: Change AudioTrack by Language Priority

OpenPLI's team have made some Audio Priority implementation,
but i think this isnt optimal when languages which will be used in priority rulles must be predefined in code
(to able add new track title always developers hands requered)

this feature must be as simple for users as simple for developers(make once and forget about it)

from user side:
AudioSelection menu have new button[Menu] where comes that suboptions
1. add current selected tracktitle to priority list
2. change order in priority list(ok=select; up=move up; down=move down; red=remove from list)

from developers side:
1. values stored in /etc/enigma2/settings
parameter: config.audio.LanguagePriority=Latvian#Russian#rus#English#englisch#engl#orj#dos#ORY#orig#org#Tonoption 2#
without count limit
2. used on first zap(when not stored last used track in /etc/enigma2/lamedb)
at the read PMT, and change order of audiotracks in AudioMenu

examle:
if PMT shows there are that tracks

and prio list is is =lang3#lang2#lang9 then tracks in AudioMenu must be reordered like
but when Ac3 is ON then ac3-s come first

first method of this tread Change AudioTrack by Language Priority
second(which were faster) stoped to work after some month at OE version change