filter channels on write - specifying outchannels works now

geomagio/edge/MiniSeedFactory.py

@@ -638,7 +638,10 @@ class MiniSeedFactory(TimeseriesFactory):
         """
         try:
             # Write to MiniSEED
-            timeseries.write(fh, format="MSEED")
+            ts = Stream()
+            for channel in channels:
+                ts += timeseries.select(channel=channel)
+            ts.write(fh, format="MSEED")
 
         except Exception as e:
             raise TimeseriesFactoryException(