AWS Polly (Text to speech) Pitch not clear

[Akshit123 (Akshit)]

I am using TTS polly to convert text to speech.
Issue is voice is not clear and loud also , actually pitch issue is their.

below is the function that accepts parameters for tts aws polly

_ttsBuildParam(buildParamInfo) {
       const { speed, voiceId, languageCode, speedRate } = buildParamInfo;
       let text = buildParamInfo?.text;
       let formattedText;
       // add a pause of 0.5 sec if new line comes
       text = text.replace(/\./g, '.<break time="500ms"/>');
       if (text.startsWith("<")) {
           //if text is received with tags
           formattedText = `<speak>${text}</speak>`;
       } else {
           let rate;
           // if speed rate comes as number value then set the rate else we can go for normal speed
           if (speedRate) {
               rate = Number(speedRate);
           } else {
               // set the speed for slow,normal and fast voice
               rate = speed === "slow" ? 70 : (speed === "normal") ? 85 : 100;
           }
           formattedText = `<speak><prosody rate="${rate}%">${text}</prosody></speak>`;
       }
       return {
           TextType: this.options.ivrPollySynthesizeSpeechTextType,
           Text: `${formattedText}`,
           OutputFormat: "mp3",
           VoiceId: voiceId || this.options.ivrPollySynthesizeSpeechVoiceId,
           SampleRate: this.options.ivrPollySynthesizeSpeechSampleRate,
           // languageCode passed for setting voice type
           LanguageCode: languageCode || "en-US"
       };
   }

Here voiceId is like “Joanna” in case of english and “Lupe” in case of spanish
SampleRate is 8000

Any help on this ?
@scolasticodev