Performer can not send MIDI to Audio Units effects. So, the only thing you will be able to do is pass audio through Vokator.

For that, set up Vokator on a stereo audio track as an effect plugin. Then send your audio track (with sample) to output bus 1-2. On the Voktaor track set the input to bus 1-2. If input monitoring is not set for always (setup>configure audio system>input monitoring mode) you will have to be recording to hear the signal pass through vokator.