diff --git a/2021/wireless-audio.csv b/2021/wireless-audio.csv
index 729069d..ed8c55f 100644
--- a/2021/wireless-audio.csv
+++ b/2021/wireless-audio.csv
@@ -1,7 +1,7 @@
 "function","band","bank/freq","receiver","audio mixer in"
-"headset 1",500,1,"incase",1
-"headset 2",700,1,"incase",2
-"stick herald",700,2,"incase",3
-"stick audience",800,1,"incase",4
-"stick backup",500,2,"portable","12?"
-"fosdem box",700,3,"portable","9?"
+"headset 1",500,1/1,"incase",1
+"headset 2",700,1/1,"incase",2
+"stick herald",800,1/1,"incase",4
+"stick audience",700,1/2,"incase",3
+"stick backup",500,1/2,"portable","12?"
+"fosdem box",700,1/3,"portable","9?"