diff --git a/examples/SineCosOut/SineCosOut.ino b/examples/SineCosOut/SineCosOut.ino
index 2eab88b..0d8bf81 100644
--- a/examples/SineCosOut/SineCosOut.ino
+++ b/examples/SineCosOut/SineCosOut.ino
@@ -1,5 +1,7 @@
 /*
    SineCosOut.ino  - Sine left, Cos right
+   Selectable:  Frequency, Hz
+                Amplitude, 0.00 to 1.00
    Bob Larkin 28 Dec 2020
 
    Basic test of I2S input and output.
@@ -9,12 +11,18 @@
 #include "Audio.h"       // Teensy I16 Audio Library
 #include "OpenAudio_ArduinoLibrary.h" // F32 library
 #include "AudioStream_F32.h"
+ 
+// T3.x supported sample rates: 2000, 8000, 11025, 16000, 22050, 24000, 32000, 44100, 44117, 48000,
+//                             88200, 88235 (44117*2), 95680, 96000, 176400, 176470, 192000
+// T4.x supports any sample rate the codec will hanedle.
+const float sample_rate_Hz = 24000.0f ;  // 24000, 44117, or other frequencies listed above
+const int   audio_block_samples = 128;    // Always 128, which is AUDIO_BLOCK_SAMPLES from AudioStream.h
+AudioSettings_F32 audio_settings(sample_rate_Hz, audio_block_samples);
 
 AudioSynthSineCosine_F32    sineCos;
 AudioAnalyzePeak_F32        peakL;
 AudioAnalyzePeak_F32        peakR;
-//AudioOutputI2S_OA_F32       i2sOut;
-AudioOutputI2S_F32       i2sOut;
+AudioOutputI2S_F32          i2sOut(audio_settings);
 AudioConnection_F32         patchCord0(sineCos,   0, peakL,  0);
 AudioConnection_F32         patchCord1(sineCos,   1, peakR,  0);
 AudioConnection_F32         patchCord2(sineCos,   0, i2sOut, 0);  // Sine
@@ -27,18 +35,19 @@ void setup() {
   Serial.println("OpenAudio_ArduinoLibrary - Sine-Cosine Stereo");
   // Internally, I16 memory blocks are used.  Needs modification, but
   // for now, supply 4 for F32 input and 4 for F32 output (shared).
-  AudioMemory(4);
+  //AudioMemory(4);
   AudioMemory_F32(20);
   codec1.enable();  // MUST be before inputSelect()
   codec1.inputSelect(AUDIO_INPUT_LINEIN);
-  sineCos.amplitude(0.2); sineCos.frequency(600.0f);
+  float fr = 600.0f; //  Sine wave frequency and correction for sample rate
+  sineCos.amplitude(0.2); sineCos.frequency(fr*44117.647f/sample_rate_Hz);
 }
 
 void loop() {
     Serial.print("Max float memory = ");
     Serial.println(AudioStream_F32::f32_memory_used_max);
     if(peakL.available())  Serial.print(peakL.read(), 6);
-    Serial.print(" <-L   R-> ");
+    Serial.print(" <-L  Peak level  R-> ");
     if(peakR.available())  Serial.println(peakR.read(), 6);
     delay(500);
 }
diff --git a/output_i2s_f32.cpp b/output_i2s_f32.cpp
index bdb2aae..d57d368 100644
--- a/output_i2s_f32.cpp
+++ b/output_i2s_f32.cpp
@@ -786,10 +786,10 @@ void AudioOutputI2S_F32::update(void)
 #endif
 #endif
 
-
 void AudioOutputI2S_F32::config_i2s(void) {	config_i2s(false, AudioOutputI2S_F32::sample_rate_Hz); }
 void AudioOutputI2S_F32::config_i2s(bool transferUsing32bit) {	config_i2s(transferUsing32bit, AudioOutputI2S_F32::sample_rate_Hz); }
 void AudioOutputI2S_F32::config_i2s(float fs_Hz) { config_i2s(false, fs_Hz); }
+
 void AudioOutputI2S_F32::config_i2s(bool transferUsing32bit, float fs_Hz)
 {
 #if defined(KINETISK) || defined(KINETISL)
@@ -834,9 +834,7 @@ void AudioOutputI2S_F32::config_i2s(bool transferUsing32bit, float fs_Hz)
 	// change the I2S frequencies to make the requested sample rate
 	setI2SFreq_T3(fs_Hz);  //for T3.x only!
 
-
 #elif defined(__IMXRT1062__)
-
 	CCM_CCGR5 |= CCM_CCGR5_SAI1(CCM_CCGR_ON);
 
 	// if either transmitter or receiver is enabled, do nothing
diff --git a/output_i2s_f32.h b/output_i2s_f32.h
index f0ec988..1109fa4 100644
--- a/output_i2s_f32.h
+++ b/output_i2s_f32.h
@@ -75,10 +75,8 @@ public:
 	static void scale_f32_to_i16( float32_t *p_f32, float32_t *p_i16, int len) ;
 	static void scale_f32_to_i24( float32_t *p_f32, float32_t *p_i16, int len) ;
 	static void scale_f32_to_i32( float32_t *p_f32, float32_t *p_i32, int len) ;
-	static float setI2SFreq_T3(const float);
-
-
-
+	
+	static float setI2SFreq_T3(const float);  // I2S clock for T3,x
 protected:
 	AudioOutputI2S_F32(int dummy): AudioStream_F32(2, inputQueueArray) {} // to be used only inside AudioOutputI2Sslave !!
 	static void config_i2s(void);
diff --git a/readme.md b/readme.md
index d5f41f7..ae94875 100644
--- a/readme.md
+++ b/readme.md
@@ -3,7 +3,7 @@ OpenAudio Library for Teensy
 
 *** Special Note ***  6 January 2021- This library is undergoing revision to make Teensy 4.x compatible and to add functionality.  The Tympan Library
 files and associated classes output_i2s_f32.h, output_i2s_f32.cpp, input_i2s_f32.h, input_i2s_f32.cpp are now
-ready to be used for T3.x and T4.x.  There are some restrictions, particularly this should be used with 16-bit I2S codec data. Notes and details are at the bottom of this page.  Work on the F32 i/o routines is continuing.  Thanks to Chip and @jcj83429 .
+ready to be used for T3.x and T4.x.  There are some restrictions, particularly this should be used with 16-bit I2S codec data. Codec sample rates can be varied.  Block size needsto be left at 128 for now.  Work on the F32 i/o routines is continuing.  Thanks to Chip and @jcj83429 .
 
 **Purpose**: The purpose of this library is to build upon the [Teensy Audio Library](http://www.pjrc.com/teensy/td_libs_Audio.html) to enable new functionality for real-time audio processing.