Alter Voices to sound like fighter pilot or space man

Special Interest Groups Audio Processing
2

For space men try the Phaser or Vocoder effects.

For helmet mics try the Equalizer effect, cutting the frequencies below 200 Hz and above 3000 Hz. For distortion (simulating the automatic gain control and voice activation of helmet mics) try the Leveller effect at its highest setting.

– Bill

"Over A Radio" effect
"Gas mask" effect?
Make recoding sound like speakers
phone voice sfx