diff --git a/lib/synth-audio.js b/lib/synth-audio.js
index 2209705..a4330c4 100644
--- a/lib/synth-audio.js
+++ b/lib/synth-audio.js
@@ -614,6 +614,8 @@ const synthElevenlabs = async(logger, {
   if (!process.env.JAMBONES_DISABLE_TTS_STREAMING && !renderForCaching && !disableTtsStreaming) {
     let params = '';
     params += `{api_key=${api_key}`;
+    params += ',vendor=elevenlabs';
+    params += `,voice=${voice}`;
     params += `,model_id=${model_id}`;
     params += `,optimize_streaming_latency=${opts.optimize_streaming_latency || 2}`;
     params += ',write_cache_file=1';
@@ -662,6 +664,7 @@ const synthWhisper = async(logger, {credentials, stats, voice, text, renderForCa
     let params = '';
     params += `{api_key=${api_key}`;
     params += `,model_id=${model_id}`;
+    params += ',vendor=whisper';
     params += `,voice=${voice}`;
     params += ',write_cache_file=1';
     if (speed) params += `,speed=${speed}`;