diff --git a/packages/google-cloud-texttospeech/samples/generated/v1/snippet_metadata.google.cloud.texttospeech.v1.json b/packages/google-cloud-texttospeech/samples/generated/v1/snippet_metadata.google.cloud.texttospeech.v1.json
index 0a286884486..b4ecefc9134 100644
--- a/packages/google-cloud-texttospeech/samples/generated/v1/snippet_metadata.google.cloud.texttospeech.v1.json
+++ b/packages/google-cloud-texttospeech/samples/generated/v1/snippet_metadata.google.cloud.texttospeech.v1.json
@@ -22,7 +22,7 @@
             "segments": [
                 {
                     "start": 25,
-                    "end": 56,
+                    "end": 59,
                     "type": "FULL"
                 }
             ],
@@ -62,7 +62,7 @@
             "segments": [
                 {
                     "start": 25,
-                    "end": 60,
+                    "end": 63,
                     "type": "FULL"
                 }
             ],
diff --git a/packages/google-cloud-texttospeech/samples/generated/v1/text_to_speech.list_voices.js b/packages/google-cloud-texttospeech/samples/generated/v1/text_to_speech.list_voices.js
index 54d474b895a..93e3359b3bc 100644
--- a/packages/google-cloud-texttospeech/samples/generated/v1/text_to_speech.list_voices.js
+++ b/packages/google-cloud-texttospeech/samples/generated/v1/text_to_speech.list_voices.js
@@ -23,6 +23,9 @@
 function main() {
   // [START texttospeech_v1_generated_TextToSpeech_ListVoices_async]
   /**
+   * This snippet has been automatically generated and should be regarded as a code template only.
+   * It will require modifications to work.
+   * It may require correct/in-range values for request initialization.
    * TODO(developer): Uncomment these variables before running the sample.
    */
   /**
diff --git a/packages/google-cloud-texttospeech/samples/generated/v1/text_to_speech.synthesize_speech.js b/packages/google-cloud-texttospeech/samples/generated/v1/text_to_speech.synthesize_speech.js
index 5659d0e0a7e..e8a34543f95 100644
--- a/packages/google-cloud-texttospeech/samples/generated/v1/text_to_speech.synthesize_speech.js
+++ b/packages/google-cloud-texttospeech/samples/generated/v1/text_to_speech.synthesize_speech.js
@@ -23,6 +23,9 @@
 function main(input, voice, audioConfig) {
   // [START texttospeech_v1_generated_TextToSpeech_SynthesizeSpeech_async]
   /**
+   * This snippet has been automatically generated and should be regarded as a code template only.
+   * It will require modifications to work.
+   * It may require correct/in-range values for request initialization.
    * TODO(developer): Uncomment these variables before running the sample.
    */
   /**
diff --git a/packages/google-cloud-texttospeech/samples/generated/v1beta1/snippet_metadata.google.cloud.texttospeech.v1beta1.json b/packages/google-cloud-texttospeech/samples/generated/v1beta1/snippet_metadata.google.cloud.texttospeech.v1beta1.json
index 747594f6358..ba9a9fc4af4 100644
--- a/packages/google-cloud-texttospeech/samples/generated/v1beta1/snippet_metadata.google.cloud.texttospeech.v1beta1.json
+++ b/packages/google-cloud-texttospeech/samples/generated/v1beta1/snippet_metadata.google.cloud.texttospeech.v1beta1.json
@@ -22,7 +22,7 @@
             "segments": [
                 {
                     "start": 25,
-                    "end": 56,
+                    "end": 59,
                     "type": "FULL"
                 }
             ],
@@ -62,7 +62,7 @@
             "segments": [
                 {
                     "start": 25,
-                    "end": 64,
+                    "end": 67,
                     "type": "FULL"
                 }
             ],
diff --git a/packages/google-cloud-texttospeech/samples/generated/v1beta1/text_to_speech.list_voices.js b/packages/google-cloud-texttospeech/samples/generated/v1beta1/text_to_speech.list_voices.js
index 698355f236e..3410c0eddfc 100644
--- a/packages/google-cloud-texttospeech/samples/generated/v1beta1/text_to_speech.list_voices.js
+++ b/packages/google-cloud-texttospeech/samples/generated/v1beta1/text_to_speech.list_voices.js
@@ -23,6 +23,9 @@
 function main() {
   // [START texttospeech_v1beta1_generated_TextToSpeech_ListVoices_async]
   /**
+   * This snippet has been automatically generated and should be regarded as a code template only.
+   * It will require modifications to work.
+   * It may require correct/in-range values for request initialization.
    * TODO(developer): Uncomment these variables before running the sample.
    */
   /**
diff --git a/packages/google-cloud-texttospeech/samples/generated/v1beta1/text_to_speech.synthesize_speech.js b/packages/google-cloud-texttospeech/samples/generated/v1beta1/text_to_speech.synthesize_speech.js
index 8caaf86befb..5857dd63dde 100644
--- a/packages/google-cloud-texttospeech/samples/generated/v1beta1/text_to_speech.synthesize_speech.js
+++ b/packages/google-cloud-texttospeech/samples/generated/v1beta1/text_to_speech.synthesize_speech.js
@@ -23,6 +23,9 @@
 function main(input, voice, audioConfig) {
   // [START texttospeech_v1beta1_generated_TextToSpeech_SynthesizeSpeech_async]
   /**
+   * This snippet has been automatically generated and should be regarded as a code template only.
+   * It will require modifications to work.
+   * It may require correct/in-range values for request initialization.
    * TODO(developer): Uncomment these variables before running the sample.
    */
   /**
diff --git a/packages/google-cloud-texttospeech/src/v1/text_to_speech_client.ts b/packages/google-cloud-texttospeech/src/v1/text_to_speech_client.ts
index dbd664ceb54..38d6e51fdff 100644
--- a/packages/google-cloud-texttospeech/src/v1/text_to_speech_client.ts
+++ b/packages/google-cloud-texttospeech/src/v1/text_to_speech_client.ts
@@ -228,7 +228,8 @@ export class TextToSpeechClient {
       const apiCall = this._gaxModule.createApiCall(
         callPromise,
         this._defaults[methodName],
-        descriptor
+        descriptor,
+        this._opts.fallback
       );
 
       this.innerApiCalls[methodName] = apiCall;
diff --git a/packages/google-cloud-texttospeech/src/v1beta1/text_to_speech_client.ts b/packages/google-cloud-texttospeech/src/v1beta1/text_to_speech_client.ts
index 6e92206b0aa..fc824029f32 100644
--- a/packages/google-cloud-texttospeech/src/v1beta1/text_to_speech_client.ts
+++ b/packages/google-cloud-texttospeech/src/v1beta1/text_to_speech_client.ts
@@ -228,7 +228,8 @@ export class TextToSpeechClient {
       const apiCall = this._gaxModule.createApiCall(
         callPromise,
         this._defaults[methodName],
-        descriptor
+        descriptor,
+        this._opts.fallback
       );
 
       this.innerApiCalls[methodName] = apiCall;
diff --git a/packages/google-cloud-texttospeech/test/gapic_text_to_speech_v1.ts b/packages/google-cloud-texttospeech/test/gapic_text_to_speech_v1.ts
index 3041b7b2fa7..4e913f3f233 100644
--- a/packages/google-cloud-texttospeech/test/gapic_text_to_speech_v1.ts
+++ b/packages/google-cloud-texttospeech/test/gapic_text_to_speech_v1.ts
@@ -50,99 +50,101 @@ function stubSimpleCallWithCallback<ResponseType>(
 }
 
 describe('v1.TextToSpeechClient', () => {
-  it('has servicePath', () => {
-    const servicePath = texttospeechModule.v1.TextToSpeechClient.servicePath;
-    assert(servicePath);
-  });
-
-  it('has apiEndpoint', () => {
-    const apiEndpoint = texttospeechModule.v1.TextToSpeechClient.apiEndpoint;
-    assert(apiEndpoint);
-  });
-
-  it('has port', () => {
-    const port = texttospeechModule.v1.TextToSpeechClient.port;
-    assert(port);
-    assert(typeof port === 'number');
-  });
-
-  it('should create a client with no option', () => {
-    const client = new texttospeechModule.v1.TextToSpeechClient();
-    assert(client);
-  });
+  describe('Common methods', () => {
+    it('has servicePath', () => {
+      const servicePath = texttospeechModule.v1.TextToSpeechClient.servicePath;
+      assert(servicePath);
+    });
 
-  it('should create a client with gRPC fallback', () => {
-    const client = new texttospeechModule.v1.TextToSpeechClient({
-      fallback: true,
+    it('has apiEndpoint', () => {
+      const apiEndpoint = texttospeechModule.v1.TextToSpeechClient.apiEndpoint;
+      assert(apiEndpoint);
     });
-    assert(client);
-  });
 
-  it('has initialize method and supports deferred initialization', async () => {
-    const client = new texttospeechModule.v1.TextToSpeechClient({
-      credentials: {client_email: 'bogus', private_key: 'bogus'},
-      projectId: 'bogus',
+    it('has port', () => {
+      const port = texttospeechModule.v1.TextToSpeechClient.port;
+      assert(port);
+      assert(typeof port === 'number');
     });
-    assert.strictEqual(client.textToSpeechStub, undefined);
-    await client.initialize();
-    assert(client.textToSpeechStub);
-  });
 
-  it('has close method for the initialized client', done => {
-    const client = new texttospeechModule.v1.TextToSpeechClient({
-      credentials: {client_email: 'bogus', private_key: 'bogus'},
-      projectId: 'bogus',
+    it('should create a client with no option', () => {
+      const client = new texttospeechModule.v1.TextToSpeechClient();
+      assert(client);
     });
-    client.initialize();
-    assert(client.textToSpeechStub);
-    client.close().then(() => {
-      done();
+
+    it('should create a client with gRPC fallback', () => {
+      const client = new texttospeechModule.v1.TextToSpeechClient({
+        fallback: true,
+      });
+      assert(client);
     });
-  });
 
-  it('has close method for the non-initialized client', done => {
-    const client = new texttospeechModule.v1.TextToSpeechClient({
-      credentials: {client_email: 'bogus', private_key: 'bogus'},
-      projectId: 'bogus',
+    it('has initialize method and supports deferred initialization', async () => {
+      const client = new texttospeechModule.v1.TextToSpeechClient({
+        credentials: {client_email: 'bogus', private_key: 'bogus'},
+        projectId: 'bogus',
+      });
+      assert.strictEqual(client.textToSpeechStub, undefined);
+      await client.initialize();
+      assert(client.textToSpeechStub);
     });
-    assert.strictEqual(client.textToSpeechStub, undefined);
-    client.close().then(() => {
-      done();
+
+    it('has close method for the initialized client', done => {
+      const client = new texttospeechModule.v1.TextToSpeechClient({
+        credentials: {client_email: 'bogus', private_key: 'bogus'},
+        projectId: 'bogus',
+      });
+      client.initialize();
+      assert(client.textToSpeechStub);
+      client.close().then(() => {
+        done();
+      });
     });
-  });
 
-  it('has getProjectId method', async () => {
-    const fakeProjectId = 'fake-project-id';
-    const client = new texttospeechModule.v1.TextToSpeechClient({
-      credentials: {client_email: 'bogus', private_key: 'bogus'},
-      projectId: 'bogus',
+    it('has close method for the non-initialized client', done => {
+      const client = new texttospeechModule.v1.TextToSpeechClient({
+        credentials: {client_email: 'bogus', private_key: 'bogus'},
+        projectId: 'bogus',
+      });
+      assert.strictEqual(client.textToSpeechStub, undefined);
+      client.close().then(() => {
+        done();
+      });
     });
-    client.auth.getProjectId = sinon.stub().resolves(fakeProjectId);
-    const result = await client.getProjectId();
-    assert.strictEqual(result, fakeProjectId);
-    assert((client.auth.getProjectId as SinonStub).calledWithExactly());
-  });
 
-  it('has getProjectId method with callback', async () => {
-    const fakeProjectId = 'fake-project-id';
-    const client = new texttospeechModule.v1.TextToSpeechClient({
-      credentials: {client_email: 'bogus', private_key: 'bogus'},
-      projectId: 'bogus',
+    it('has getProjectId method', async () => {
+      const fakeProjectId = 'fake-project-id';
+      const client = new texttospeechModule.v1.TextToSpeechClient({
+        credentials: {client_email: 'bogus', private_key: 'bogus'},
+        projectId: 'bogus',
+      });
+      client.auth.getProjectId = sinon.stub().resolves(fakeProjectId);
+      const result = await client.getProjectId();
+      assert.strictEqual(result, fakeProjectId);
+      assert((client.auth.getProjectId as SinonStub).calledWithExactly());
     });
-    client.auth.getProjectId = sinon
-      .stub()
-      .callsArgWith(0, null, fakeProjectId);
-    const promise = new Promise((resolve, reject) => {
-      client.getProjectId((err?: Error | null, projectId?: string | null) => {
-        if (err) {
-          reject(err);
-        } else {
-          resolve(projectId);
-        }
+
+    it('has getProjectId method with callback', async () => {
+      const fakeProjectId = 'fake-project-id';
+      const client = new texttospeechModule.v1.TextToSpeechClient({
+        credentials: {client_email: 'bogus', private_key: 'bogus'},
+        projectId: 'bogus',
+      });
+      client.auth.getProjectId = sinon
+        .stub()
+        .callsArgWith(0, null, fakeProjectId);
+      const promise = new Promise((resolve, reject) => {
+        client.getProjectId((err?: Error | null, projectId?: string | null) => {
+          if (err) {
+            reject(err);
+          } else {
+            resolve(projectId);
+          }
+        });
       });
+      const result = await promise;
+      assert.strictEqual(result, fakeProjectId);
     });
-    const result = await promise;
-    assert.strictEqual(result, fakeProjectId);
   });
 
   describe('listVoices', () => {
diff --git a/packages/google-cloud-texttospeech/test/gapic_text_to_speech_v1beta1.ts b/packages/google-cloud-texttospeech/test/gapic_text_to_speech_v1beta1.ts
index 0c20d4b6398..8d4fab2d66b 100644
--- a/packages/google-cloud-texttospeech/test/gapic_text_to_speech_v1beta1.ts
+++ b/packages/google-cloud-texttospeech/test/gapic_text_to_speech_v1beta1.ts
@@ -50,101 +50,103 @@ function stubSimpleCallWithCallback<ResponseType>(
 }
 
 describe('v1beta1.TextToSpeechClient', () => {
-  it('has servicePath', () => {
-    const servicePath =
-      texttospeechModule.v1beta1.TextToSpeechClient.servicePath;
-    assert(servicePath);
-  });
-
-  it('has apiEndpoint', () => {
-    const apiEndpoint =
-      texttospeechModule.v1beta1.TextToSpeechClient.apiEndpoint;
-    assert(apiEndpoint);
-  });
-
-  it('has port', () => {
-    const port = texttospeechModule.v1beta1.TextToSpeechClient.port;
-    assert(port);
-    assert(typeof port === 'number');
-  });
-
-  it('should create a client with no option', () => {
-    const client = new texttospeechModule.v1beta1.TextToSpeechClient();
-    assert(client);
-  });
+  describe('Common methods', () => {
+    it('has servicePath', () => {
+      const servicePath =
+        texttospeechModule.v1beta1.TextToSpeechClient.servicePath;
+      assert(servicePath);
+    });
 
-  it('should create a client with gRPC fallback', () => {
-    const client = new texttospeechModule.v1beta1.TextToSpeechClient({
-      fallback: true,
+    it('has apiEndpoint', () => {
+      const apiEndpoint =
+        texttospeechModule.v1beta1.TextToSpeechClient.apiEndpoint;
+      assert(apiEndpoint);
     });
-    assert(client);
-  });
 
-  it('has initialize method and supports deferred initialization', async () => {
-    const client = new texttospeechModule.v1beta1.TextToSpeechClient({
-      credentials: {client_email: 'bogus', private_key: 'bogus'},
-      projectId: 'bogus',
+    it('has port', () => {
+      const port = texttospeechModule.v1beta1.TextToSpeechClient.port;
+      assert(port);
+      assert(typeof port === 'number');
     });
-    assert.strictEqual(client.textToSpeechStub, undefined);
-    await client.initialize();
-    assert(client.textToSpeechStub);
-  });
 
-  it('has close method for the initialized client', done => {
-    const client = new texttospeechModule.v1beta1.TextToSpeechClient({
-      credentials: {client_email: 'bogus', private_key: 'bogus'},
-      projectId: 'bogus',
+    it('should create a client with no option', () => {
+      const client = new texttospeechModule.v1beta1.TextToSpeechClient();
+      assert(client);
     });
-    client.initialize();
-    assert(client.textToSpeechStub);
-    client.close().then(() => {
-      done();
+
+    it('should create a client with gRPC fallback', () => {
+      const client = new texttospeechModule.v1beta1.TextToSpeechClient({
+        fallback: true,
+      });
+      assert(client);
     });
-  });
 
-  it('has close method for the non-initialized client', done => {
-    const client = new texttospeechModule.v1beta1.TextToSpeechClient({
-      credentials: {client_email: 'bogus', private_key: 'bogus'},
-      projectId: 'bogus',
+    it('has initialize method and supports deferred initialization', async () => {
+      const client = new texttospeechModule.v1beta1.TextToSpeechClient({
+        credentials: {client_email: 'bogus', private_key: 'bogus'},
+        projectId: 'bogus',
+      });
+      assert.strictEqual(client.textToSpeechStub, undefined);
+      await client.initialize();
+      assert(client.textToSpeechStub);
     });
-    assert.strictEqual(client.textToSpeechStub, undefined);
-    client.close().then(() => {
-      done();
+
+    it('has close method for the initialized client', done => {
+      const client = new texttospeechModule.v1beta1.TextToSpeechClient({
+        credentials: {client_email: 'bogus', private_key: 'bogus'},
+        projectId: 'bogus',
+      });
+      client.initialize();
+      assert(client.textToSpeechStub);
+      client.close().then(() => {
+        done();
+      });
     });
-  });
 
-  it('has getProjectId method', async () => {
-    const fakeProjectId = 'fake-project-id';
-    const client = new texttospeechModule.v1beta1.TextToSpeechClient({
-      credentials: {client_email: 'bogus', private_key: 'bogus'},
-      projectId: 'bogus',
+    it('has close method for the non-initialized client', done => {
+      const client = new texttospeechModule.v1beta1.TextToSpeechClient({
+        credentials: {client_email: 'bogus', private_key: 'bogus'},
+        projectId: 'bogus',
+      });
+      assert.strictEqual(client.textToSpeechStub, undefined);
+      client.close().then(() => {
+        done();
+      });
     });
-    client.auth.getProjectId = sinon.stub().resolves(fakeProjectId);
-    const result = await client.getProjectId();
-    assert.strictEqual(result, fakeProjectId);
-    assert((client.auth.getProjectId as SinonStub).calledWithExactly());
-  });
 
-  it('has getProjectId method with callback', async () => {
-    const fakeProjectId = 'fake-project-id';
-    const client = new texttospeechModule.v1beta1.TextToSpeechClient({
-      credentials: {client_email: 'bogus', private_key: 'bogus'},
-      projectId: 'bogus',
+    it('has getProjectId method', async () => {
+      const fakeProjectId = 'fake-project-id';
+      const client = new texttospeechModule.v1beta1.TextToSpeechClient({
+        credentials: {client_email: 'bogus', private_key: 'bogus'},
+        projectId: 'bogus',
+      });
+      client.auth.getProjectId = sinon.stub().resolves(fakeProjectId);
+      const result = await client.getProjectId();
+      assert.strictEqual(result, fakeProjectId);
+      assert((client.auth.getProjectId as SinonStub).calledWithExactly());
     });
-    client.auth.getProjectId = sinon
-      .stub()
-      .callsArgWith(0, null, fakeProjectId);
-    const promise = new Promise((resolve, reject) => {
-      client.getProjectId((err?: Error | null, projectId?: string | null) => {
-        if (err) {
-          reject(err);
-        } else {
-          resolve(projectId);
-        }
+
+    it('has getProjectId method with callback', async () => {
+      const fakeProjectId = 'fake-project-id';
+      const client = new texttospeechModule.v1beta1.TextToSpeechClient({
+        credentials: {client_email: 'bogus', private_key: 'bogus'},
+        projectId: 'bogus',
+      });
+      client.auth.getProjectId = sinon
+        .stub()
+        .callsArgWith(0, null, fakeProjectId);
+      const promise = new Promise((resolve, reject) => {
+        client.getProjectId((err?: Error | null, projectId?: string | null) => {
+          if (err) {
+            reject(err);
+          } else {
+            resolve(projectId);
+          }
+        });
       });
+      const result = await promise;
+      assert.strictEqual(result, fakeProjectId);
     });
-    const result = await promise;
-    assert.strictEqual(result, fakeProjectId);
   });
 
   describe('listVoices', () => {