I have Bose QC-35 headphones. Noise canceling does not work on any radio when you use the cord. Headphones work well with a Bluetooth connection.What kind of device do I use, if and when my K4 is delivered?Also on the K4 can a USB port expander be used on the K4 with multiple devices and what is the K4 limited to?Jim K9TFSent from my T-Mobile 4G LTE Device