With VDI, no battery inside, there is no sound at all.....pressing the model knob does not illuminate the LED, pressing the Alt Tuning knob does nothing.....no mags, no models nothing. 
  
I just tried the battery, after charging it, plugged into 1/4 input.  Pressing the Model know still does not illuminate the LED.   Did not plug into amp dute to it being so late here. 
  
I've never used the 1/4 input before.  Always used with the VDI cable, no battery ever put in guitar.