Setting the music for meditations

Hello, I find that during meditations the music is not loud enough or the voice is too loud in relation to the music. I'd like to be able to adjust this myself, as other apps offer (meditopia for example).

Because it depends on each person's needs, but I need to hear the music to soothe me, and a voice that's not too loud... and maybe some people have other needs in relation to that.

Thank you for your consideration!