[Freeswitch-users] How can I cancel an entire file_string list of files from a playback?

Hi, I am playing a list of files using playback with a file_string list. If I send a break command to the channel, then only the currently playing fileis stopped, and then the playback continues on to the next file.   I tried to use "break all" but that cancels the entire dialplan application queue,and the call gets terminated. How can I just cancel all the files in the playback file_string? Thanks,David