For those who have Version 3.3a of the DSOA MK2 software, there is an error in the documentation which decribes the new trigger switch modification described in the "Modifications For the MK2 Unit" section (line 779-) The text should read "S6" and not "S7" all through the paragraph. S7 of course is the trigger polarity switch, and not the start/stop switch, which is the one that needs the mod. Sorry for any loss of hair caused !. Many thanks to Ian Conry for pointing this out. Regards, David L. Jones Advanced R&D Solutions 6/9/95