This driver is for the B&K CT600 and CT300 series multi-zone systems, connected to the XP processor via RS232 or Ethernet. Version 1.1 fixes problems with the system not tracking tuner frequency changes. It adds better support for 'All Zones' commands as well as returning separate status for All Zones, and creates a new integer return for source numbers for more flexibility in zone renaming. Version 1.11 fixes AM tuner frequency display and the reversed STA+ and STA- commands. Version 1.12 fixes the missing 'Zone F FM Frequency' variable.