public Builder setVoices(
        int index, com.google.cloud.texttospeech.v1.Voice.Builder builderForValue) {
      if (voicesBuilder_ == null) {
        ensureVoicesIsMutable();
        voices_.set(index, builderForValue.build());
        onChanged();
      } else {
        voicesBuilder_.setMessage(index, builderForValue.build());
      }
      return this;
    }
<pre>
The list of voices.
</pre>

<code>repeated .google.cloud.texttospeech.v1.Voice voices = 1;</code>
java-texttospeech/proto-google-cloud-texttospeech-v1/src/main/java/com/google/cloud/texttospeech/v1/ListVoicesResponse.java