Using input 1 & 2 for stereo Guitar - HD500X in POD HD Posted March 20, 2017 It can be confusing as in reality there are 2x2 paths in the HD but to keep the paths separate they cannot be summed by the mixer or any stereo effects. The stereo to two mono jacks are somewhat common enough. They are made. You can also make your own. On the HD you can select the inputs for the 2x2 paths in the input menu. One guitar the other Aux. You can use the amp blocks to put effects on their own path. Any for both can go before the block. Keep the mixer hard left and hard right. You will get two paths from the HD. Again no stereo FX after the amp block with FX on each side.