Hi Karzy,
I am one of the developers of Voxal. I'm sorry to hear that you're having problems with Voice Pitch Shifter. If you could give me more information about the bug, I will look into it and solve it for you as soon as possible. I will appreciate if you could answer few questions for me:
1. Are you using custom effect chain or a preset one? If custom what are the effects in the list?
2. Do you get any problem with preset voices which contains voice pitch shifter, such as Female 2?
3. When do you get "Voxal is unable to detect an audio stream" error message, as soon as you open the Voxal or as soon as you preview a voice with voice pitch shifter effect or after some time starting the preview? If it is the third one, how long does it take to receive "Voxal is unable to detect an audio stream" message?
4. Does the issue occurs in real time voice changing ? To test this you can start voxal and then use a recording software to record your voice while Voxal is open.
5. Could you also test if there is any issue with file processing? To test this you can use the process file tool to process and modify the sound in a file with the selected voice.
Again, I am sorry for the issue you are facing, I will try my best to fix it. If you could answer these questions, it will be really helpful in identifying the bug as I can't reproduce the same problem on my end.
Regards,
Yusuf