Fixed frequency misuse

on-host/arpist-traject/src/semantics.rs

@@ -115,9 +115,9 @@ impl Executor {
 
                                     // update time reference
                                     prev_t = t;
-                                    t = prev_t + freq
+                                    t = prev_t + 1.0 / freq
                                 }
-                                self.last_timeref = Some(t);
+                                self.last_timeref = Some(end_t);
                             } else {
                                 return Err("Invalid time reference".to_string());
                             }