diff --git a/plugins/samplemimo/audiocatsiso/audiocatoutputworker.cpp b/plugins/samplemimo/audiocatsiso/audiocatoutputworker.cpp
index 963cc1446..8f23521bf 100644
--- a/plugins/samplemimo/audiocatsiso/audiocatoutputworker.cpp
+++ b/plugins/samplemimo/audiocatsiso/audiocatoutputworker.cpp
@@ -25,7 +25,7 @@
 
 #include "audiocatoutputworker.h"
 
-#define AUDIOOUTPUT_THROTTLE_MS 50
+#define AUDIOOUTPUT_THROTTLE_MS 100
 
 AudioCATOutputWorker::AudioCATOutputWorker(SampleMOFifo* sampleFifo, AudioFifo *fifo, QObject* parent) :
     QObject(parent),
@@ -41,7 +41,7 @@ AudioCATOutputWorker::AudioCATOutputWorker(SampleMOFifo* sampleFifo, AudioFifo *
     m_sampleFifo(sampleFifo),
     m_audioFifo(fifo)
 {
-    m_audioBuffer.resize(1<<15);
+    m_audioBuffer.resize(12000);
     m_audioBufferFill = 0;
     setSamplerate(48000);
 }
diff --git a/plugins/samplemimo/audiocatsiso/audiocatsiso.cpp b/plugins/samplemimo/audiocatsiso/audiocatsiso.cpp
index ca580280b..4347d6936 100644
--- a/plugins/samplemimo/audiocatsiso/audiocatsiso.cpp
+++ b/plugins/samplemimo/audiocatsiso/audiocatsiso.cpp
@@ -46,7 +46,7 @@ MESSAGE_CLASS_DEFINITION(AudioCATSISO::MsgStartStop, Message)
 AudioCATSISO::AudioCATSISO(DeviceAPI *deviceAPI) :
     m_deviceAPI(deviceAPI),
     m_inputFifo(48000),
-    m_outputFifo(48000),
+    m_outputFifo(24000),
 	m_settings(),
     m_inputWorker(nullptr),
     m_outputWorker(nullptr),
diff --git a/plugins/samplemimo/audiocatsiso/audiocatsisogui.cpp b/plugins/samplemimo/audiocatsiso/audiocatsisogui.cpp
index 918c868f4..bb0b23098 100644
--- a/plugins/samplemimo/audiocatsiso/audiocatsisogui.cpp
+++ b/plugins/samplemimo/audiocatsiso/audiocatsisogui.cpp
@@ -257,6 +257,14 @@ void AudioCATSISOGUI::on_streamLock_toggled(bool checked)
     }
 }
 
+void AudioCATSISOGUI::on_freqRxToTx_clicked()
+{
+    m_settings.m_txCenterFrequency = m_settings.m_rxCenterFrequency;
+    displayFrequency();
+    m_settingsKeys.append("txCenterFrequency");
+    sendSettings();
+}
+
 void AudioCATSISOGUI::on_centerFrequency_changed(quint64 value)
 {
     if (m_rxElseTx)
@@ -771,7 +779,8 @@ void AudioCATSISOGUI::makeUIConnections()
 	QObject::connect(ui->streamSide, QOverload<int>::of(&QComboBox::currentIndexChanged), this, &AudioCATSISOGUI::on_streamSide_currentIndexChanged);
     QObject::connect(ui->spectrumSide, QOverload<int>::of(&QComboBox::currentIndexChanged), this, &AudioCATSISOGUI::on_spectrumSide_currentIndexChanged);
     QObject::connect(ui->streamLock, &QToolButton::toggled, this, &AudioCATSISOGUI::on_streamLock_toggled);
-	QObject::connect(ui->startStop, &ButtonSwitch::toggled, this, &AudioCATSISOGUI::on_startStop_toggled);
+	QObject::connect(ui->freqRxToTx, &QPushButton::clicked, this, &AudioCATSISOGUI::on_freqRxToTx_clicked);
+    QObject::connect(ui->startStop, &ButtonSwitch::toggled, this, &AudioCATSISOGUI::on_startStop_toggled);
 	QObject::connect(ui->ptt, &ButtonSwitch::toggled, this, &AudioCATSISOGUI::on_ptt_toggled);
 	QObject::connect(ui->catConnect, &ButtonSwitch::toggled, this, &AudioCATSISOGUI::on_catConnect_toggled);
     QObject::connect(ui->centerFrequency, &ValueDial::changed, this, &AudioCATSISOGUI::on_centerFrequency_changed);
diff --git a/plugins/samplemimo/audiocatsiso/audiocatsisogui.h b/plugins/samplemimo/audiocatsiso/audiocatsisogui.h
index c750714a8..a8a300140 100644
--- a/plugins/samplemimo/audiocatsiso/audiocatsisogui.h
+++ b/plugins/samplemimo/audiocatsiso/audiocatsisogui.h
@@ -89,6 +89,7 @@ private slots:
     void on_streamSide_currentIndexChanged(int index);
     void on_spectrumSide_currentIndexChanged(int index);
     void on_streamLock_toggled(bool checked);
+    void on_freqRxToTx_clicked();
 	void on_startStop_toggled(bool checked);
     void on_ptt_toggled(bool checked);
     void on_pttSpectrumLinkToggled(bool checked);
diff --git a/plugins/samplemimo/audiocatsiso/audiocatsisogui.ui b/plugins/samplemimo/audiocatsiso/audiocatsisogui.ui
index 4fc028312..7c2bf51d4 100644
--- a/plugins/samplemimo/audiocatsiso/audiocatsisogui.ui
+++ b/plugins/samplemimo/audiocatsiso/audiocatsisogui.ui
@@ -160,6 +160,23 @@
        </property>
       </widget>
      </item>
+     <item>
+      <widget class="QPushButton" name="freqRxToTx">
+       <property name="toolTip">
+        <string>Send Rx frequency to Tx</string>
+       </property>
+       <property name="text">
+        <string/>
+       </property>
+       <property name="icon">
+        <iconset resource="../../../sdrgui/resources/res.qrc">
+         <normaloff>:/arrow_left.png</normaloff>:/arrow_left.png</iconset>
+       </property>
+       <property name="checkable">
+        <bool>true</bool>
+       </property>
+      </widget>
+     </item>
      <item>
       <widget class="ButtonSwitch" name="txEnable">
        <property name="toolTip">