It's not exactly misleading, once you get the background. The TACN system was built out statewide to provide coverage for state agencies. In Knox County, that meant two sites were placed on TACN (Sharps Ridge 002-020 and Black Rd 002-019). Most of the TACN system resides on the 700 MHz frequencies.
When Knox County Emergency Communications District (KCECD) opted to upgrade their 'old' Motorola trunking system, they also opted to tie into TACN, albeit as their own controlled 'site' (003-010). They reused their 800 MHz frequencies and the backbone is tied into TACN. The KCECD system is 5 simulcast sites, that in two cases are at the same physical location as the true TACN sites at Black Rd and Sharps Ridge.
Now, as for KFD, their new station alerting system uses a canned voice (Lola) for the audio dispatches. That's what you're hearing about 99% of the time. There are usually 2, sometimes 3 human dispatchers on duty just for KFD and they handle all radio comms on TAC talk groups, as well as the routine traffic on the Dispatch talk group. Their comm center works 4 shifts, 12 hr, on a 7 day rotation. The dispatchers do not rotate days/nights, so you'll typically hear the same voices (aside from Lola) every other week. The KFD dispatchers also handle dispatching for Karns (Vol) Fire Dept, but I'm not sure if Lola is on their dispatch talk group.
Glad we were able to help you get connected. Keep in touch and Happy New Year!