Bugfix in lasp_daq.pyx. This was the reason of the initial tick in the audio. The CppSleep was done with the GIL held. Sometimes indentation is what you need in PYthon...

lasp/device/lasp_daq.pyx

@@ -263,8 +263,8 @@ cdef class Daq:
             self.sd.thread = new CPPThread[void*, void (*)(void*)](audioCallbackPythonThreadFunction,
             <void*> self.sd)
 
-       # Allow stream stome time to start
-        CPPsleep_ms(500)
+           # Allow stream stome time to start
+            CPPsleep_ms(300)
 
         self.daq_device.start(
         self.sd.inQueue,

lasp/device/lasp_daqconfig.pyx

@@ -75,6 +75,8 @@ cdef class DaqConfiguration:
     """
     Initialize a device descriptor
     """
+    def __cinit__(self):
+        pass
 
     def __str__(self):
         return str(self.to_json())

scripts/lasp_record

@@ -43,8 +43,6 @@ if __name__ == '__main__':
     choosen_key = config_keys[daqindex]
     config = configs[choosen_key].input_config
 
-    config.__reduce__()
-
     print(f'Choosen configuration: {choosen_key}')
 
     try: