Wish there was a male voice too...
It sounds so weird whenever the female voice says a masculine sentence, like "jestem brudny"! Surely that doesn't help anyone learn the different gender endings (especially for past tense verbs)?
I also think that's strange when a female say something with masculine for and reversed XD And when I write a composition as a male XD I think it'llbe helpful. But you don't have to wait for adding another voice, you can go here: https://www.ivona.com/ it's the same TTS, made for Polish language, but there are more voices: 3 female and 2 male. You can copy masculine sentences, paste them there and play it pronunced by a male voice :)