diff --git a/ext/bscacquisition.py b/ext/bscacquisition.py
index 5c789d8..06774d9 100644
--- a/ext/bscacquisition.py
+++ b/ext/bscacquisition.py
@@ -12,7 +12,7 @@ class BSCAcquisition(Acquisition):
         self.bscache = bscache
         self.use_channels = use_channels
         self.grp = 0
-        super().__init__(*args, default_channels=bscache.channels.keys(), **kwargs)
+        super().__init__(*args, default_channels= self.use_channels or self.bscache.channels.keys(), **kwargs)
 
     def setGroup(self,idx):
         self.grp = idx
@@ -38,5 +38,4 @@ class BSCAcquisition(Acquisition):
                     dname = chn.replace(':','/')+'/data'
                     hid.create_dataset(dname, data=singledata)
                     dpid = dname.replace('/data','/pid')
-                    hid[dpid] = hid[pidname]
-
+                    hid[dpid] = hid[pidname]
\ No newline at end of file