></A>
If you give <B>C_==2</B> on "inactive", events affected to channel 2 will be removed from the display. They are not deleted, but you can't select them, modify them nor hear them until they're activated again. <B>S_==1</B> would affect only selected events, <B>(S_==1)&&(C_==2) </B>would affect selected events from channel 2, etc...<BR><BR>

As for "operation", there's an history to the "active/inactive" tests: (It is kept in array<B> FIF</B>)<BR>
<B>:</B>n recalls test number n (same as typing <B>:FIF[