+ bool isTrackLocked(int ix) const;
+
+ /** @brief Sets the duration of track @param ix to @param duration.
+ * This does not! influence the actual track but only the value in its TrackInfo. */
+ void setTrackDuration(int ix, int duration);
+
+ /** @brief Returns the duration of track @param ix.
+ *
+ * The returned duration might differ from the actual track duration!
+ * It is the one stored in the track's TrackInfo. */
+ int trackDuration(int ix);
+