diff --git a/examples/arduino-rx/arduino-rx.ino b/examples/arduino-rx/arduino-rx.ino
index 637bb7c..9cad340 100644
--- a/examples/arduino-rx/arduino-rx.ino
+++ b/examples/arduino-rx/arduino-rx.ino
@@ -6,7 +6,7 @@
 static const char channels = 1;
 
 // default PCM output frequency
-static const int frequency = 10000;
+static const int frequency = GGWave::kBaseSampleRate;
 
 const int qmax = 1024;
 volatile int qhead = 0;
@@ -52,7 +52,7 @@ void loop() {
     auto p = GGWave::getDefaultParameters();
     p.sampleRateInp = frequency;
     p.sampleFormatInp = GGWAVE_SAMPLE_FORMAT_I16;
-    p.payloadLength = 4;
+    p.payloadLength = 16;
     GGWave instance(p);
 
     static GGWave::CBWaveformInp cbWaveformInp = [&](void * data, uint32_t nMaxBytes) {
diff --git a/examples/arduino-rx/ggwave/ggwave.h b/examples/arduino-rx/ggwave/ggwave.h
index 0066b45..b620958 100644
--- a/examples/arduino-rx/ggwave/ggwave.h
+++ b/examples/arduino-rx/ggwave/ggwave.h
@@ -286,15 +286,15 @@ extern "C" {
 
 class GGWave {
 public:
-    static constexpr auto kBaseSampleRate = 10000.0f;
-    static constexpr auto kSampleRateMin = 6000.0f;
+    static constexpr auto kBaseSampleRate = 6000.0f;
+    static constexpr auto kSampleRateMin = 1000.0f;
     static constexpr auto kSampleRateMax = 10000.0f;
-    static constexpr auto kDefaultSamplesPerFrame = 256;
+    static constexpr auto kDefaultSamplesPerFrame = 128;
     static constexpr auto kDefaultVolume = 10;
     static constexpr auto kDefaultSoundMarkerThreshold = 3.0f;
     static constexpr auto kDefaultMarkerFrames = 16;
     static constexpr auto kDefaultEncodedDataOffset = 3;
-    static constexpr auto kMaxSamplesPerFrame = 256;
+    static constexpr auto kMaxSamplesPerFrame = 128;
     static constexpr auto kMaxDataBits = 256;
     static constexpr auto kMaxDataSize = 256;
     static constexpr auto kMaxLengthVarible = 140;
@@ -324,15 +324,15 @@ public:
 
     static const TxProtocols & getTxProtocols() {
         static const TxProtocols kTxProtocols {
-            { GGWAVE_TX_PROTOCOL_AUDIBLE_NORMAL,        { "Normal",       40,  9, 3, } },
-            { GGWAVE_TX_PROTOCOL_AUDIBLE_FAST,          { "Fast",         40,  6, 3, } },
-            { GGWAVE_TX_PROTOCOL_AUDIBLE_FASTEST,       { "Fastest",      40,  3, 3, } },
+            //{ GGWAVE_TX_PROTOCOL_AUDIBLE_NORMAL,        { "Normal",       40,  9, 3, } },
+            //{ GGWAVE_TX_PROTOCOL_AUDIBLE_FAST,          { "Fast",         40,  6, 3, } },
+            //{ GGWAVE_TX_PROTOCOL_AUDIBLE_FASTEST,       { "Fastest",      40,  3, 3, } },
             //{ GGWAVE_TX_PROTOCOL_ULTRASOUND_NORMAL,     { "[U] Normal",   320, 9, 3, } },
             //{ GGWAVE_TX_PROTOCOL_ULTRASOUND_FAST,       { "[U] Fast",     320, 6, 3, } },
             //{ GGWAVE_TX_PROTOCOL_ULTRASOUND_FASTEST,    { "[U] Fastest",  320, 3, 3, } },
             //{ GGWAVE_TX_PROTOCOL_DT_NORMAL,             { "[DT] Normal",  24,  9, 1, } },
             //{ GGWAVE_TX_PROTOCOL_DT_FAST,               { "[DT] Fast",    24,  6, 1, } },
-            //{ GGWAVE_TX_PROTOCOL_DT_FASTEST,            { "[DT] Fastest", 24,  3, 1, } },
+            { GGWAVE_TX_PROTOCOL_DT_FASTEST,            { "[DT] Fastest", 24,  3, 1, } },
         };
 
         return kTxProtocols;
@@ -430,7 +430,7 @@ public:
 
     // Tx
 
-    static TxProtocolId getDefaultTxProtocolId()     { return GGWAVE_TX_PROTOCOL_AUDIBLE_NORMAL; }
+    static TxProtocolId getDefaultTxProtocolId()     { return getTxProtocols().begin()->first; }
     static const TxProtocol & getDefaultTxProtocol() { return getTxProtocols().at(getDefaultTxProtocolId()); }
     static const TxProtocol & getTxProtocol(int id)  { return getTxProtocols().at(TxProtocolId(id)); }
     static const TxProtocol & getTxProtocol(TxProtocolId id) { return getTxProtocols().at(id); }
diff --git a/examples/ggwave-common-sdl2.cpp b/examples/ggwave-common-sdl2.cpp
index c68321b..c6bcc03 100644
--- a/examples/ggwave-common-sdl2.cpp
+++ b/examples/ggwave-common-sdl2.cpp
@@ -122,7 +122,7 @@ bool GGWave_init(
         playbackSpec.freq = GGWave::kBaseSampleRate + sampleRateOffset;
         playbackSpec.format = AUDIO_S16SYS;
         playbackSpec.channels = 1;
-        playbackSpec.samples = 16*1024;
+        playbackSpec.samples = (16*1024*GGWave::kBaseSampleRate)/48000;
         playbackSpec.callback = NULL;
 
         SDL_zero(g_obtainedSpecOut);
diff --git a/include/ggwave/ggwave.h b/include/ggwave/ggwave.h
index e6b5687..1af5e04 100644
--- a/include/ggwave/ggwave.h
+++ b/include/ggwave/ggwave.h
@@ -287,14 +287,14 @@ extern "C" {
 class GGWave {
 public:
     static constexpr auto kBaseSampleRate = 48000.0f;
-    static constexpr auto kSampleRateMin = 6000.0f;
+    static constexpr auto kSampleRateMin = 1000.0f;
     static constexpr auto kSampleRateMax = 96000.0f;
     static constexpr auto kDefaultSamplesPerFrame = 1024;
     static constexpr auto kDefaultVolume = 10;
     static constexpr auto kDefaultSoundMarkerThreshold = 3.0f;
     static constexpr auto kDefaultMarkerFrames = 16;
     static constexpr auto kDefaultEncodedDataOffset = 3;
-    static constexpr auto kMaxSamplesPerFrame = 2048;
+    static constexpr auto kMaxSamplesPerFrame = 1024;
     static constexpr auto kMaxDataBits = 256;
     static constexpr auto kMaxDataSize = 256;
     static constexpr auto kMaxLengthVarible = 140;
diff --git a/src/ggwave.cpp b/src/ggwave.cpp
index fa8f6d5..aed64e2 100644
--- a/src/ggwave.cpp
+++ b/src/ggwave.cpp
@@ -1294,6 +1294,10 @@ void GGWave::decode_fixed() {
         const int binStart = rxProtocol.freqStart;
         const int binDelta = 16;
 
+        if (binStart > kMaxSamplesPerFrame) {
+            continue;
+        }
+
         const int totalLength = m_payloadLength + getECCBytesForLength(m_payloadLength);
         const int totalTxs = (totalLength + rxProtocol.bytesPerTx - 1)/rxProtocol.bytesPerTx;