Bug? Tuner only responds to one input

[caruso]

Is there any way to route two inputs to the tuner? I play chapman stick and need to tune the bass and treble sides which are plugged in to the front input and back left input. I cannot get the tuner to 'hear" the back left input any ideas?
Thanks

 

[Hubertus]

Is there any way to route two inputs to the tuner? I play chapman stick and need to tune the bass and treble sides which are plugged in to the front input and back left input. I cannot get the tuner to 'hear" the back left input any ideas?
Thanks

No bug. It's by design.