Cannot regulate the volume up

I really need help. Since new version 3.2.1 I have big problems to overhear what I recorded.
Before (old version), I used the toolbar slider on the top right to make the volume louder, but this does not exist any longer!
I can’t find what is wrong. The output is chosen corrrectly via earphones, and if I regulate the slider left of the voicetrack line to a maximum, I can hear at least so much through my earphones that I can work with it. When I have finished, I do have to regulate it back to 0 ofr -1 db.
Any ideas?

PS: Anyone here to help me in German?

The sliders are now incorporated into the meters …
sliders now in the meters.gif