diff --git a/config_webrx.py b/config_webrx.py
index e402bc1..b6c2d21 100644
--- a/config_webrx.py
+++ b/config_webrx.py
@@ -176,6 +176,8 @@ csdr_dynamic_bufsize = False # This allows you to change the buffering mode of c
 csdr_print_bufsizes = False  # This prints the buffer sizes used for csdr processes.
 csdr_through = False # Setting this True will print out how much data is going into the DSP chains.
 
+nmux_memory = 70 #in megabytes. This sets the approximate size of the circular buffer used by nmux.
+
 #Look up external IP address automatically from icanhazip.com, and use it as [server_hostname]
 """
 print "[openwebrx-config] Detecting external IP address..."
diff --git a/openwebrx.py b/openwebrx.py
index 92f1876..84f4d66 100755
--- a/openwebrx.py
+++ b/openwebrx.py
@@ -20,7 +20,8 @@ print "" # python2.7 is required to run OpenWebRX instead of python3. Please run
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 """
-sw_version="v0.14+"
+sw_version="v0.15"
+#0.15 (added nmux)
 
 import os
 import code
@@ -151,7 +152,14 @@ def main():
 		print "[openwebrx-main] You need to install an up-to-date version of \"csdr\" that contains the \"nmux\" tool to run OpenWebRX! Please upgrade \"csdr\"!\n"
 		return
 	if cfg.start_rtl_thread:
-		cfg.start_rtl_command += "| nmux -p %d -a 127.0.0.1" % cfg.iq_server_port
+                nmux_bufcnt = nmux_bufsize = 0
+                while nmux_bufsize < cfg.samp_rate/4: nmux_bufsize += 4096
+                while nmux_bufsize * nmux_bufcnt < cfg.nmux_memory * 1e6: nmux_bufcnt += 1
+                if nmux_bufcnt == 0 or nmux_bufsize == 0: 
+                    print "[openwebrx-main] Error: nmux_bufsize or nmux_bufcnt is zero. These depend on nmux_memory and samp_rate options in config_webrx.py"
+                    return
+                print "[openwebrx-main] nmux_bufsize = %d, nmux_bufcnt = %d" % (nmux_bufsize, nmux_bufcnt)
+		cfg.start_rtl_command += "| nmux --bufsize %d --bufcnt %d --port %d --address 127.0.0.1" % (nmux_bufsize, nmux_bufcnt, cfg.iq_server_port)
 		rtl_thread=threading.Thread(target = lambda:subprocess.Popen(cfg.start_rtl_command, shell=True),  args=())
 		rtl_thread.start()
 		print "[openwebrx-main] Started rtl_thread: "+cfg.start_rtl_command