As strange as this is, it seems to hagve something to do with the noise level chosen. You may also want to be sure your setting for track marks is set to none, as opposed to 1 or more seconds. Why the noise level setting should have anything to do with how these units decide to set track marks, I have no clue. John --------------------------------------------------------------------------- To leave the list at any time, please write to <ptr1-users-request@xxxxxxxxxxxxx> with unsubscribe ptr1-users in the subject or the body. The list home page is at <//www.freelists.org/list/ptr1-users/>.