diff --git a/sdrgui/gui/glspectrumview.cpp b/sdrgui/gui/glspectrumview.cpp
index 1df1d9d54..4ec3cc976 100644
--- a/sdrgui/gui/glspectrumview.cpp
+++ b/sdrgui/gui/glspectrumview.cpp
@@ -2423,7 +2423,8 @@ void GLSpectrumView::peakWidth(const Real *spectrum, int center, int &left, int
     float prevRight = spectrum[center];
     left = center - 1;
     right = center + 1;
-    while ((left > maxLeft) && (spectrum[left] < prevLeft) && (right < maxRight) && (spectrum[right] < prevRight))
+    // Use <= as SSB spectrums have duplicated values
+    while ((left > maxLeft) && (spectrum[left] <= prevLeft) && (right < maxRight) && (spectrum[right] <= prevRight))
     {
         prevLeft = spectrum[left];
         left--;
diff --git a/sdrsrv/mainserver.cpp b/sdrsrv/mainserver.cpp
index ae6ed5e0e..4e517ecac 100644
--- a/sdrsrv/mainserver.cpp
+++ b/sdrsrv/mainserver.cpp
@@ -495,11 +495,20 @@ void MainServer::changeSampleSource(int deviceSetIndex, int selectedDeviceIndex)
         DeviceSampleSource *source = deviceSet->m_deviceAPI->getPluginInterface()->createSampleSourcePluginInstance(
                 deviceSet->m_deviceAPI->getSamplingDeviceId(), deviceSet->m_deviceAPI);
         deviceSet->m_deviceAPI->setSampleSource(source);
-
-        deviceSet->m_deviceAPI->loadSamplingDeviceSettings(m_mainCore->m_settings.getWorkingPreset()); // load new API settings
-
-        // Notify
-        emit m_mainCore->deviceChanged(deviceSetIndex);
+        // wait for sample source to be set, before loading settings
+        auto connection = new QMetaObject::Connection();
+        *connection = connect(
+            deviceSet->m_deviceSourceEngine,
+            &DSPDeviceSourceEngine::sampleSet,
+            this,
+            [=]() {
+                deviceSet->m_deviceAPI->loadSamplingDeviceSettings(m_mainCore->m_settings.getWorkingPreset()); // load new API settings
+                // Notify
+                emit m_mainCore->deviceChanged(deviceSetIndex);
+                QObject::disconnect(*connection);
+                delete connection;
+            }
+        );
     }
 }
 
@@ -566,8 +575,20 @@ void MainServer::changeSampleSink(int deviceSetIndex, int selectedDeviceIndex)
         DeviceSampleSink *sink = deviceSet->m_deviceAPI->getPluginInterface()->createSampleSinkPluginInstance(
                 deviceSet->m_deviceAPI->getSamplingDeviceId(), deviceSet->m_deviceAPI);
         deviceSet->m_deviceAPI->setSampleSink(sink);
-
-        deviceSet->m_deviceAPI->loadSamplingDeviceSettings(m_mainCore->m_settings.getWorkingPreset()); // load new API settings
+        // wait for sample source to be set, before loading settings
+        auto connection = new QMetaObject::Connection();
+        *connection = connect(
+            deviceSet->m_deviceSourceEngine,
+            &DSPDeviceSourceEngine::sampleSet,
+            this,
+            [=]() {
+                deviceSet->m_deviceAPI->loadSamplingDeviceSettings(m_mainCore->m_settings.getWorkingPreset()); // load new API settings
+                // Notify
+                emit m_mainCore->deviceChanged(deviceSetIndex);
+                QObject::disconnect(*connection);
+                delete connection;
+            }
+        );
     }
 }
 
@@ -620,8 +641,20 @@ void MainServer::changeSampleMIMO(int deviceSetIndex, int selectedDeviceIndex)
         DeviceSampleMIMO *mimo = deviceSet->m_deviceAPI->getPluginInterface()->createSampleMIMOPluginInstance(
                 deviceSet->m_deviceAPI->getSamplingDeviceId(), deviceSet->m_deviceAPI);
         deviceSet->m_deviceAPI->setSampleMIMO(mimo);
-
-        deviceSet->m_deviceAPI->loadSamplingDeviceSettings(m_mainCore->m_settings.getWorkingPreset()); // load new API settings
+        // wait for sample source to be set, before loading settings
+        auto connection = new QMetaObject::Connection();
+        *connection = connect(
+            deviceSet->m_deviceSourceEngine,
+            &DSPDeviceSourceEngine::sampleSet,
+            this,
+            [=]() {
+                deviceSet->m_deviceAPI->loadSamplingDeviceSettings(m_mainCore->m_settings.getWorkingPreset()); // load new API settings
+                // Notify
+                emit m_mainCore->deviceChanged(deviceSetIndex);
+                QObject::disconnect(*connection);
+                delete connection;
+            }
+        );
     }
 }
 
diff --git a/swagger/sdrangel/examples/add_channel.py b/swagger/sdrangel/examples/add_channel.py
old mode 100644
new mode 100755
index ee35a6b4a..27a2320c8
--- a/swagger/sdrangel/examples/add_channel.py
+++ b/swagger/sdrangel/examples/add_channel.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 import requests, json, traceback, sys
 from optparse import OptionParser
@@ -12,12 +12,12 @@ def getInputOptions():
     parser = OptionParser(usage="usage: %%prog [-t]\n")
     parser.add_option("-a", "--address", dest="address", help="address and port", metavar="ADDRESS", type="string")
     parser.add_option("-d", "--device-index", dest="device_index", help="device set index", metavar="INDEX", type="int")
-    parser.add_option("-c", "--channel-id", dest="channel_id", help="channel ID of channel to add", metavar="ID", type="string")
+    parser.add_option("-c", "--channel-id", dest="channel_id", help="channel ID of channel to add (E.g. NFMDemod)", metavar="ID", type="string")
 
     (options, args) = parser.parse_args()
 
     if options.address is None:
-        options.address = "127.0.0.1:8888"
+        options.address = "127.0.0.1:8091"
 
     if options.device_index is None or options.device_index < 0:
         options.device_index = 0
@@ -37,12 +37,12 @@ def main():
         base_url = "http://%s/sdrangel" % options.address
         device_url = base_url + ("/deviceset/%d/channel" % options.device_index)
         r = requests.post(url=device_url, json={"direction": 0, "channelType": options.channel_id})
-        if r.status_code / 100 == 2:
+        if r.status_code // 100 == 2:
             print("Success")
-            print json.dumps(r.json(), indent=4, sort_keys=True)
+            print(json.dumps(r.json(), indent=4, sort_keys=True))
         else:
             print("Error adding channel. HTTP: %d" % r.status_code)
-            print json.dumps(r.json(), indent=4, sort_keys=True)
+            print(json.dumps(r.json(), indent=4, sort_keys=True))
 
     except Exception as ex:
         tb = traceback.format_exc()
diff --git a/swagger/sdrangel/examples/rtlsdr_settings.py b/swagger/sdrangel/examples/rtlsdr_settings.py
old mode 100644
new mode 100755
index a07d7ce84..af59174d6
--- a/swagger/sdrangel/examples/rtlsdr_settings.py
+++ b/swagger/sdrangel/examples/rtlsdr_settings.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 import requests, json
 
 base_url = "http://127.0.0.1:8091/sdrangel"
@@ -14,7 +14,7 @@ requests_methods = {
 
 def getHwType():
     r = requests.get(url=base_url + "/deviceset/0")
-    if r.status_code / 100 == 2:
+    if r.status_code // 100 == 2:
         rj = r.json()
         devj = rj.get('samplingDevice', None)
         if devj is not None:
@@ -27,8 +27,8 @@ def getHwType():
 
 def selectRtlSdr():
     r = requests.put(url=base_url + "/deviceset/0/device", json={"hwType": "RTLSDR"})
-    if r.status_code / 100 == 2:
-        print json.dumps(r.json(), indent=4, sort_keys=True)
+    if r.status_code // 100 == 2:
+        print(json.dumps(r.json(), indent=4, sort_keys=True))
         return True
     else:
         return False
@@ -36,7 +36,7 @@ def selectRtlSdr():
 
 def getRtlSdrSettings():
     r = requests.get(url=base_url + "/deviceset/0/device/settings")
-    if r.status_code / 100 == 2:
+    if r.status_code // 100 == 2:
         rj = r.json()
         hwType = rj.get('deviceHwType', None)
         if hwType is not None and hwType == "RTLSDR":
@@ -51,10 +51,10 @@ def getRtlSdrSettings():
 def patchRtlSdrSettings(settings):
     new_settings = {"deviceHwType": "RTLSDR", "direction": 0, "rtlSdrSettings": settings}
     r = requests.patch(url=base_url + "/deviceset/0/device/settings", json=new_settings)
-    if r.status_code / 100 == 2:
-        print json.dumps(r.json(), indent=4, sort_keys=True)
+    if r.status_code // 100 == 2:
+        print(json.dumps(r.json(), indent=4, sort_keys=True))
     else:
-        print "Error HTTP:", r.status_code
+        print("Error HTTP:", r.status_code)
 
 
 def deviceRun(run):
@@ -62,10 +62,10 @@ def deviceRun(run):
         r = requests.post(url=base_url + "/deviceset/0/device/run")
     else:
         r = requests.delete(url=base_url + "/deviceset/0/device/run")
-    if r.status_code / 100 == 2:
-        print json.dumps(r.json(), indent=4, sort_keys=True)
+    if r.status_code // 100 == 2:
+        print(json.dumps(r.json(), indent=4, sort_keys=True))
     else:
-        print "Error HTTP:", r.status_code
+        print("Error HTTP:", r.status_code)
 
 
 def main():
@@ -73,8 +73,10 @@ def main():
     if hwType is not None:
         if hwType != "RTLSDR":
             if not selectRtlSdr():
+                print("Device set 0 is not an RTLSDR device")
                 return
     else:
+        print("Device set 0 does not exist")
         return
     settings = getRtlSdrSettings()
     if settings is not None:
diff --git a/swagger/sdrangel/examples/rx_test.py b/swagger/sdrangel/examples/rx_test.py
index 1eafec6a0..b2651834c 100755
--- a/swagger/sdrangel/examples/rx_test.py
+++ b/swagger/sdrangel/examples/rx_test.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 import requests, json, traceback, sys, time
 from optparse import OptionParser