This kind of audio processors to modify the tone and the formant of voice with effects are legal and can be used everywhere. What is not legal is to commit crimes by using a voice modulator for example to scare or bullying someone on social networks, or to disguise the voice to threaten someone in a phone call.
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If the goal using a voice changer is to have fun, it is not illegal. If you discover someone who uses software or a voice processing device to commit a crime, you should notify the police as soon as possible to take care of the problem. Mac os x 10 6 8 dmg.
And remember there is no bad tool but misuse of this.
At first it is very difficult to reverse the effect that a voice changer applies to a voice. What is possible is to cancel part of the audio processing to be able to clearly identify an audio that has been modified.
For this it is necessary to identify what type of sound effects have been applied to a sample to be able to counteract them using VST plugins or processors in an audio editor. https://eodu.over-blog.com/2020/12/mac-computer-hard-drive.html. For example, in case the voice sounds with a low tone, you can reverse part of the effect by raising the pitch and applying an EQ in the high frequencies. So you can reverse part of the effect of the voice changer.