Steve Henke, W9SH, and Jim Dixon have completed the coding of a new channel driver for asterisk named chan_usbradio.c which allows app_rpt to work with modified USB sound fobs based on the CM108 chip. There is an initial write up about this new hardware interface on my site at http://app-rpt.qrvc.com/usbsoundfob.html. The USB channel driver has DSP code in it for CTCSS detection and generation, squelch, pre-emphasis and de-emphasis, audio level setting, and soft limiting. You only need to make 3 connections to a repeater. Discriminator audio, transmit audio. and PTT. A COR input is supported, but not required. The hardware is really inexpensive! USB sound fobs can be bought for $7.95 at places like geeks.com. You will need 3 resistors, a Shottky diode, and an NPN transistor in order to complete the modification. A schematic detailing the modifications and pictures of the USB sound fob before and after modification are posted on at the URL above. I am working on a set of detailed modification instructions with pictures so that those who want to use this interface can modify the USB sound fob themselves. Have Fun! Steve Rodgers, WA6ZFT