diff --git a/config_webrx.py b/config_webrx.py
index e50e7b9..ea693c1 100644
--- a/config_webrx.py
+++ b/config_webrx.py
@@ -117,9 +117,9 @@ To use a HackRF, compile the HackRF host tools from its "stdout" branch:
 #format_conversion="csdr convert_s16_f | csdr gain_ff 30"
 
 # >> /dev/urandom test signal source
-samp_rate = 2400000
-start_rtl_command="cat /dev/urandom | (pv -qL `python -c 'print int({samp_rate} * 2.2)'` 2>&1)".format(rf_gain=rf_gain, center_freq=center_freq, samp_rate=samp_rate)
-format_conversion="csdr convert_u8_f"
+#samp_rate = 2400000
+#start_rtl_command="cat /dev/urandom | (pv -qL `python -c 'print int({samp_rate} * 2.2)'` 2>&1)".format(rf_gain=rf_gain, center_freq=center_freq, samp_rate=samp_rate)
+#format_conversion="csdr convert_u8_f"
 
 # >> Pre-recorded raw I/Q file as signal source
 # You will have to correctly specify: samp_rate, center_freq, format_conversion in order to correctly play an I/Q file.
diff --git a/htdocs/gfx/openwebrx-3d-spectrum.png b/htdocs/gfx/openwebrx-3d-spectrum.png
new file mode 100644
index 0000000..06ad495
Binary files /dev/null and b/htdocs/gfx/openwebrx-3d-spectrum.png differ
diff --git a/htdocs/index.wrx b/htdocs/index.wrx
index b45754c..be0d43c 100644
--- a/htdocs/index.wrx
+++ b/htdocs/index.wrx
@@ -107,7 +107,7 @@
 						<div class="openwebrx-button openwebrx-square-button" onclick="zoomOutOneStep();" title="Zoom out one step"> <img src="gfx/openwebrx-zoom-out.png" /></div>
 						<div class="openwebrx-button openwebrx-square-button" onclick="zoomInTotal();"  title="Zoom in totally"><img src="gfx/openwebrx-zoom-in-total.png" /></div>
 						<div class="openwebrx-button openwebrx-square-button" onclick="zoomOutTotal();" title="Zoom out totally"><img src="gfx/openwebrx-zoom-out-total.png" /></div>
-						<div class="openwebrx-button openwebrx-square-button" onclick="mathbox_toggle();" title="Zoom out totally"><img src="gfx/openwebrx-zoom-out-total.png" /></div>
+						<div class="openwebrx-button openwebrx-square-button" onclick="mathbox_toggle();" title="Zoom out totally"><img src="gfx/openwebrx-3d-spectrum.png" /></div>
 						<div id="openwebrx-smeter-db">0 dB</div>
 					</div>
 					<div class="openwebrx-panel-line">
diff --git a/htdocs/openwebrx.js b/htdocs/openwebrx.js
index 3c2c105..642b121 100644
--- a/htdocs/openwebrx.js
+++ b/htdocs/openwebrx.js
@@ -1925,16 +1925,16 @@ function mathbox_init()
 	mathbox_container.appendChild((mathbox_element=three.renderer.domElement));
     view = mathbox
     .set({
-      scale: 720,
+      scale: 1080,
       focus: 3,
     })
     .camera({
       proxy: true,
-      position: [2, 1, 3],
+      position: [-2, 1, 3],
     })
     .cartesian({
-      range: [[0, 1], [0, 1], [0, 1]],
-      scale: [1, 2/3, 1],
+      range: [[-1, 1], [0, 1], [0, 1]],
+      scale: [2, 2/3, 1],
     });
 
     view.axis({
@@ -1946,6 +1946,7 @@ function mathbox_init()
       axis: 2,
       width: 3,
 	  color: "#fff",
+	  //offset: [0, 0, 0],
   });
     view.axis({
       axis: 3,