public com.google.cloud.texttospeech.v1.CustomVoiceParamsOrBuilder getCustomVoiceOrBuilder() {
      if (customVoiceBuilder_ != null) {
        return customVoiceBuilder_.getMessageOrBuilder();
      } else {
        return customVoice_ == null
            ? com.google.cloud.texttospeech.v1.CustomVoiceParams.getDefaultInstance()
            : customVoice_;
      }
    }
<pre>
The configuration for a custom voice. If [CustomVoiceParams.model] is set,
the service will choose the custom voice matching the specified
configuration.
</pre>

<code>.google.cloud.texttospeech.v1.CustomVoiceParams custom_voice = 4;</code>
java-texttospeech/proto-google-cloud-texttospeech-v1/src/main/java/com/google/cloud/texttospeech/v1/VoiceSelectionParams.java