I found using a sound generator at 6000hz to 5000hz sawtooth wave form in a sound sweep tends to kill my voices. Or just adjusting the frequency around 6000hz in sawtooth. There’s free apps called tone generator for your Iphone or android.
How long does the effect last?
Are your voices from a separate place?
They say they are to me. But when I use the sound generator at those frequencies they go quiet fast.
I found running the tone generator at around 1900hz works better at sinus wave.
A very well done my friend your on the way out.
Just keep going.
Try playing a Scatter Frequency nose and see if that works just as well !
Just a thought!