diff --git a/htdocs/openwebrx.js b/htdocs/openwebrx.js
index 1694c30..be3a143 100644
--- a/htdocs/openwebrx.js
+++ b/htdocs/openwebrx.js
@@ -2628,19 +2628,19 @@ function secondary_demod_init()
 function secondary_demod_start(subtype) 
 { 
     secondary_demod_canvases_initialized = false;
-    ws.send("SET secondary_mod="+subtype); 
-    secondary_demod = subtype; 
+	ws.send(JSON.stringify({"type":"dspcontrol","params":{"secondary_mod":subtype}}));
+    secondary_demod = subtype;
 }
 
 function secondary_demod_set()
 {
-    ws.send("SET secondary_offset_freq="+secondary_demod_offset_freq.toString());
+	ws.send(JSON.stringify({"type":"dspcontrol","params":{"secondary_offset_freq":secondary_demod_offset_freq}}));
 }
 
 function secondary_demod_stop()
 {
-    ws.send("SET secondary_mod=off");
-    secondary_demod = false; 
+	ws.send(JSON.stringify({"type":"dspcontrol","params":{"secondary_mod":false}}));
+    secondary_demod = false;
     secondary_demod_waterfall_queue = [];
 }
 
@@ -2767,7 +2767,7 @@ function secondary_demod_update_channel_freq_from_event(evt)
     {
         secondary_demod_waiting_for_set = true;
         window.setTimeout(()=>{
-            ws.send("SET secondary_offset_freq="+Math.floor(secondary_demod_channel_freq));
+            ws.send(JSON.stringify({"type":"dspcontrol","params":{"secondary_offset_freq":Math.floor(secondary_demod_channel_freq)}}));
             //console.log("doneset:", secondary_demod_channel_freq);
             secondary_demod_waiting_for_set = false;
         }, 50);
diff --git a/owrx/source.py b/owrx/source.py
index 551fcc3..12ac470 100644
--- a/owrx/source.py
+++ b/owrx/source.py
@@ -136,6 +136,21 @@ class DspManager(object):
             self.dsp.start()
         self.localProps.getProperty("mod").wire(set_mod)
 
+        if (pm.getPropertyValue("digimodes_enable")):
+            def set_secondary_mod(mod):
+                self.dsp.stop()
+                if mod == False:
+                    self.dsp.set_secondary_demodulator(None)
+                else:
+                    self.dsp.set_secondary_demodulator(mod)
+                    # TODO frontend will probably miss this
+                    #rxws.send(self, "MSG secondary_fft_size={0} if_samp_rate={1} secondary_bw={2} secondary_setup".format(cfg.digimodes_fft_size, dsp.if_samp_rate(), dsp.secondary_bw()))
+                self.dsp.start()
+
+            self.localProps.getProperty("secondary_mod").wire(set_secondary_mod)
+
+            self.localProps.getProperty("secondary_offset_freq").wire(self.dsp.set_secondary_offset_freq)
+
         super().__init__()
 
     def start(self):