Ok so I'm having a wierd issue with ELS. So long story short, i want to use ELS and non ELS vehicles together (so fire trucks actually sound like fire trucks). All the vehicles i have work great and I love each one of them, but when a non ELS vehicle shows up on scene, all the ELS vehicles stop working. Can you not use ELS and non ELS together? Does it really have to be one or the other, or have i just done something wrong?