diff --git a/output.wav b/output.wav
index 91bad2e..7883ed9 100644
Binary files a/output.wav and b/output.wav differ
diff --git a/sbv2_core/src/bert.rs b/sbv2_core/src/bert.rs
index 50762bf..3bd8396 100644
--- a/sbv2_core/src/bert.rs
+++ b/sbv2_core/src/bert.rs
@@ -1,14 +1,6 @@
 use crate::error::Result;
 use ndarray::Array2;
-use ort::{GraphOptimizationLevel, Session};
-
-pub fn load_model(model_file: &str) -> Result<Session> {
-    let session = Session::builder()?
-        .with_optimization_level(GraphOptimizationLevel::Level3)?
-        .with_intra_threads(1)?
-        .commit_from_file(model_file)?;
-    Ok(session)
-}
+use ort::Session;
 
 pub fn predict(
     session: &Session,
diff --git a/sbv2_core/src/lib.rs b/sbv2_core/src/lib.rs
index b058762..0482063 100644
--- a/sbv2_core/src/lib.rs
+++ b/sbv2_core/src/lib.rs
@@ -6,6 +6,7 @@ pub mod mora;
 pub mod nlp;
 pub mod norm;
 pub mod style;
+pub mod tts;
 pub mod utils;
 
 pub fn add(left: usize, right: usize) -> usize {
diff --git a/sbv2_core/src/main.rs b/sbv2_core/src/main.rs
index b2d9a0f..63ad56b 100644
--- a/sbv2_core/src/main.rs
+++ b/sbv2_core/src/main.rs
@@ -1,78 +1,18 @@
-use ndarray::{concatenate, s, Array, Array1, Array2, Axis};
-use sbv2_core::{bert, error, jtalk, model, nlp, norm, style, utils};
+use sbv2_core::{error, tts};
 
 fn main() -> error::Result<()> {
-    let text = "隣の客はよくかき食う客だ";
+    let text = "おはようございます。";
 
-    let normalized_text = norm::normalize_text(text);
-
-    let jtalk = jtalk::JTalk::new()?;
-    let (phones, tones, mut word2ph) = jtalk.g2p(&normalized_text)?;
-    let (phones, tones, lang_ids) = nlp::cleaned_text_to_sequence(phones, tones);
-
-    // add black
-    let phones = utils::intersperse(&phones, 0);
-    let tones = utils::intersperse(&tones, 0);
-    let lang_ids = utils::intersperse(&lang_ids, 0);
-    for i in 0..word2ph.len() {
-        word2ph[i] *= 2;
-    }
-    word2ph[0] += 1;
-
-    let tokenizer = jtalk::get_tokenizer()?;
-    let (token_ids, attention_masks) = jtalk::tokenize(&normalized_text, &tokenizer)?;
-
-    let session = bert::load_model("models/debert.onnx")?;
-    let bert_content = bert::predict(&session, token_ids, attention_masks)?;
-
-    assert!(
-        word2ph.len() == normalized_text.chars().count() + 2,
-        "{} {}",
-        word2ph.len(),
-        normalized_text.chars().count()
-    );
-
-    let mut phone_level_feature = vec![];
-    for i in 0..word2ph.len() {
-        // repeat_feature = np.tile(bert_content[i], (word2ph[i], 1))
-        let repeat_feature = {
-            let (reps_rows, reps_cols) = (word2ph[i], 1);
-            let arr_len = bert_content.slice(s![i, ..]).len();
-
-            let mut results: Array2<f32> = Array::zeros((reps_rows as usize, arr_len * reps_cols));
-
-            for j in 0..reps_rows {
-                for k in 0..reps_cols {
-                    let mut view = results.slice_mut(s![j, k * arr_len..(k + 1) * arr_len]);
-                    view.assign(&bert_content.slice(s![i, ..]));
-                }
-            }
-            results
-        };
-        phone_level_feature.push(repeat_feature);
-    }
-    // ph = np.concatenate(phone_level_feature, axis=0)
-    // bert_ori = ph.T
-    let phone_level_feature = concatenate(
-        Axis(0),
-        &phone_level_feature
-            .iter()
-            .map(|x| x.view())
-            .collect::<Vec<_>>(),
+    let tts_model = tts::TTSModel::new(
+        "models/debert.onnx",
+        "models/model_opt.onnx",
+        "models/style_vectors.json",
     )?;
-    let bert_ori = phone_level_feature.t();
 
-    let session = bert::load_model("models/model_opt.onnx")?;
-    let style_vectors = style::load_style("models/style_vectors.json")?;
-    let style_vector = style::get_style_vector(style_vectors, 0, 1.0)?;
-    model::synthesize(
-        &session,
-        bert_ori.to_owned(),
-        Array1::from_vec(phones.iter().map(|x| *x as i64).collect()),
-        Array1::from_vec(tones.iter().map(|x| *x as i64).collect()),
-        Array1::from_vec(lang_ids.iter().map(|x| *x as i64).collect()),
-        style_vector,
-    )?;
+    let (bert_ori, phones, tones, lang_ids) = tts_model.parse_text(text)?;
+
+    let style_vector = tts_model.get_style_vector(0, 1.0)?;
+    tts_model.synthesize(bert_ori.to_owned(), phones, tones, lang_ids, style_vector)?;
 
     Ok(())
 }
diff --git a/sbv2_core/src/model.rs b/sbv2_core/src/model.rs
index 50da5b5..d5c0eb2 100644
--- a/sbv2_core/src/model.rs
+++ b/sbv2_core/src/model.rs
@@ -1,7 +1,15 @@
 use crate::error::Result;
 use hound::{SampleFormat, WavSpec, WavWriter};
 use ndarray::{array, Array1, Array2, Axis};
-use ort::Session;
+use ort::{GraphOptimizationLevel, Session};
+
+pub fn load_model(model_file: &str) -> Result<Session> {
+    let session = Session::builder()?
+        .with_optimization_level(GraphOptimizationLevel::Level3)?
+        .with_intra_threads(1)?
+        .commit_from_file(model_file)?;
+    Ok(session)
+}
 
 fn write_wav(file_path: &str, audio: &[f32], sample_rate: u32) -> Result<()> {
     let spec = WavSpec {
diff --git a/sbv2_core/src/nlp.rs b/sbv2_core/src/nlp.rs
index 253edb6..541cfc1 100644
--- a/sbv2_core/src/nlp.rs
+++ b/sbv2_core/src/nlp.rs
@@ -13,12 +13,12 @@ static SYMBOL_TO_ID: Lazy<HashMap<String, i32>> = Lazy::new(|| {
 pub fn cleaned_text_to_sequence(
     cleaned_phones: Vec<String>,
     tones: Vec<i32>,
-) -> (Vec<i32>, Vec<i32>, Vec<i32>) {
-    let phones: Vec<i32> = cleaned_phones
+) -> (Vec<i64>, Vec<i64>, Vec<i64>) {
+    let phones: Vec<i64> = cleaned_phones
         .iter()
-        .map(|phone| *SYMBOL_TO_ID.get(phone).unwrap())
+        .map(|phone| *SYMBOL_TO_ID.get(phone).unwrap() as i64)
         .collect();
-    let tones: Vec<i32> = tones.iter().map(|tone| *tone + 6).collect();
-    let lang_ids: Vec<i32> = vec![1; phones.len()];
+    let tones: Vec<i64> = tones.iter().map(|tone| (*tone + 6) as i64).collect();
+    let lang_ids: Vec<i64> = vec![1; phones.len()];
     (phones, tones, lang_ids)
 }
diff --git a/sbv2_core/src/tts.rs b/sbv2_core/src/tts.rs
new file mode 100644
index 0000000..26b7434
--- /dev/null
+++ b/sbv2_core/src/tts.rs
@@ -0,0 +1,121 @@
+use crate::error::Result;
+use crate::{bert, jtalk, model, nlp, norm, style, utils};
+use ndarray::{concatenate, s, Array, Array1, Array2, Axis};
+use ort::Session;
+
+pub struct TTSModel {
+    bert: Session,
+    vits2: Session,
+    style_vectors: Array2<f32>,
+    jtalk: jtalk::JTalk,
+}
+
+impl TTSModel {
+    pub fn new(
+        bert_model_path: &str,
+        main_model_path: &str,
+        style_vector_path: &str,
+    ) -> Result<Self> {
+        let bert = model::load_model(bert_model_path)?;
+        let vits2 = model::load_model(main_model_path)?;
+        let style_vectors = style::load_style(style_vector_path)?;
+        let jtalk = jtalk::JTalk::new()?;
+        Ok(TTSModel {
+            bert,
+            vits2,
+            style_vectors,
+            jtalk,
+        })
+    }
+
+    pub fn parse_text(
+        &self,
+        text: &str,
+    ) -> Result<(Array2<f32>, Array1<i64>, Array1<i64>, Array1<i64>)> {
+        let normalized_text = norm::normalize_text(text);
+
+        let (phones, tones, mut word2ph) = self.jtalk.g2p(&normalized_text)?;
+        let (phones, tones, lang_ids) = nlp::cleaned_text_to_sequence(phones, tones);
+
+        let phones = utils::intersperse(&phones, 0);
+        let tones = utils::intersperse(&tones, 0);
+        let lang_ids = utils::intersperse(&lang_ids, 0);
+        for i in 0..word2ph.len() {
+            word2ph[i] *= 2;
+        }
+        word2ph[0] += 1;
+
+        let tokenizer = jtalk::get_tokenizer()?;
+        let (token_ids, attention_masks) = jtalk::tokenize(&normalized_text, &tokenizer)?;
+
+        let bert_content = bert::predict(&self.bert, token_ids, attention_masks)?;
+
+        assert!(
+            word2ph.len() == normalized_text.chars().count() + 2,
+            "{} {}",
+            word2ph.len(),
+            normalized_text.chars().count()
+        );
+
+        let mut phone_level_feature = vec![];
+        for i in 0..word2ph.len() {
+            let repeat_feature = {
+                let (reps_rows, reps_cols) = (word2ph[i], 1);
+                let arr_len = bert_content.slice(s![i, ..]).len();
+
+                let mut results: Array2<f32> =
+                    Array::zeros((reps_rows as usize, arr_len * reps_cols));
+
+                for j in 0..reps_rows {
+                    for k in 0..reps_cols {
+                        let mut view = results.slice_mut(s![j, k * arr_len..(k + 1) * arr_len]);
+                        view.assign(&bert_content.slice(s![i, ..]));
+                    }
+                }
+                results
+            };
+            phone_level_feature.push(repeat_feature);
+        }
+        let phone_level_feature = concatenate(
+            Axis(0),
+            &phone_level_feature
+                .iter()
+                .map(|x| x.view())
+                .collect::<Vec<_>>(),
+        )?;
+        let bert_ori = phone_level_feature.t();
+        Ok((
+            bert_ori.to_owned(),
+            phones.into(),
+            tones.into(),
+            lang_ids.into(),
+        ))
+    }
+
+    pub fn get_style_vector(&self, style_id: i32, weight: f32) -> Result<Array1<f32>> {
+        Ok(style::get_style_vector(
+            self.style_vectors.clone(),
+            style_id,
+            weight,
+        )?)
+    }
+
+    pub fn synthesize(
+        &self,
+        bert_ori: Array2<f32>,
+        phones: Array1<i64>,
+        tones: Array1<i64>,
+        lang_ids: Array1<i64>,
+        style_vector: Array1<f32>,
+    ) -> Result<()> {
+        model::synthesize(
+            &self.vits2,
+            bert_ori.to_owned(),
+            phones,
+            tones,
+            lang_ids,
+            style_vector,
+        )?;
+        Ok(())
+    }
+}