I wish to do a voiceover. The processed audio should sound deep, grainy. Unfortunately, I don’t have a deep voice. I tried several VST plugins. Eventually, they all sound fake or demonic. The pitch shift is better in Cubase with some success.
Next, I tried to model the human vocal tract. I tried splitting the audio into two channels. To the first channel, I added an audio chopper with a chopping triangle wave at 28 Hz. This is somewhat how the vocal cords distort in our vocal tract for deep-voiced people. This output was again made to go through a low pass filter of 1000Hz because the grain mostly affects the base voice and not the high-frequency sibilance sounds like T, F, P sounds.
The second channel was added to a high pass at 1000Hz allowing only sibilances to pass. The result was interesting, but there was something wrong. Some Uncanny valley in human listening.
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