[App_rpt-users] USB URIx overmodulation problem?

I'm using a URIx module with my radio and am in the process of adjusting audio levels. I'm following the well documented procedures to set rx and tx levels but noticed that that choices in txvoice levels have little or no effect. I've made some measurements with my service monitor. radio tune txvoice 10 >> 0.35Khz deviation radio tune txvoice 14 >> 4.8Khz deviation radio tune txvoice 15 >> 4.8Khz deviation radio tune txvoice 20 >> 5.2Khz deviation radio tune txvoice 100 >> 5.2Khz deviation radio tune txvoice 500 >> 5.2Khz deviation radio tune txvoice 900 >> 5.2Khz deviation With a goal of 3KHz deviation, its not possible through settings alone. Any ideas why this is so touchy? thanks