Question about the KX1: Can the TX offset be changed from 600Hz to 500Hz by any means (not looking for a front panel control)? I know the sidetone can be changed but the 600 Hz transmit offset, at least according to the manual, is fixed at 600 Hz. 600Hz is too high for my hearing and I don't like being 100Hz off someone's frequency. That's as bad as having key clicks (almost)! Thanks. Band