I made some tests. Recordings with the Recorder app are loud enough. Perfect! Doing it with apps like Whatsapp or other messengers its very quiet. So i think it is a software problem and can be fixed by an update.
Hopefully the developers find a solution. Thank you for this ROM
Sound for typing at the Keyboard are turned off. But they i have sound while typing anyway. Mute-mode helps.
Maybe for the next update?