This release includes David G3YYD's 2Tone version 13.10b, which incorporates these improvements: - changes to ATC sampling width - changed Squelch to remember status - modified AFC function for improved lock through the use of a non-linear function - improved the Setup sound card receive open & close functions for increased reliability with WinXP.  WinWarbler itself is unchanged in this version, so if you've already replaced the previous version of 2Tone with 13.10b, there is no need to upgrade from WinWarbler 7.7.6. WinWarbler 7.7.7 is available via the DXLab Launcher or via 73, Dave, AA6YQ