Nevermind, I got it. Used "krow.dev.scheme" to fetch the proper intent (by experimening), then read out "/data/data/krow.dev.scheme/files/default.realm.managment/log_b" et voilà, done)
Then execute it like this:
sudo "am broadcast 'intent:#Intent;action=com.maxmpz.audioplayer.API_COMMAND;package=com.maxmpz.audioplayer;i.cmd=1;end'"