add a feature flag

csdr/csdr.py

@@ -76,6 +76,8 @@ class output(object):
 
 class dsp(object):
     def __init__(self, output):
+        self.pycsdr_enabled = True
+
         self.samp_rate = 250000
         self.output_rate = 11025
         self.hd_output_rate = 44100
@@ -756,6 +758,7 @@ class dsp(object):
             self.direwolf_config = None
 
     def start(self):
+        if self.pycsdr_enabled:
             if self.demodulator == "fft":
                 with self.modification_lock:
                     if self.running: