diff --git a/mk/PX4/ROMFS/mixers/FMU_pass.mix b/mk/PX4/ROMFS/mixers/FMU_pass.mix
index e9a81f2bb2..163d308251 100644
--- a/mk/PX4/ROMFS/mixers/FMU_pass.mix
+++ b/mk/PX4/ROMFS/mixers/FMU_pass.mix
@@ -3,7 +3,7 @@ Passthrough mixer for PX4FMU
 
 This file defines passthrough mixers suitable for testing.
 
-Channel group 0, channels 0-3 are passed directly through to the outputs.
+Channel group 0, channels 0-7 are passed directly through to the outputs.
 
 M: 1
 O:      10000  10000      0 -10000  10000
@@ -21,3 +21,18 @@ M: 1
 O:      10000  10000      0 -10000  10000
 S: 0 3  10000  10000      0 -10000  10000
 
+M: 1
+O:      10000  10000      0 -10000  10000
+S: 0 4  10000  10000      0 -10000  10000
+
+M: 1
+O:      10000  10000      0 -10000  10000
+S: 0 5  10000  10000      0 -10000  10000
+
+M: 1
+O:      10000  10000      0 -10000  10000
+S: 0 6  10000  10000      0 -10000  10000
+
+M: 1
+O:      10000  10000      0 -10000  10000
+S: 0 7  10000  10000      0 -10000  10000