BUG: Editor Hangs During Playback
| Article ID: | 000033 |
| Category: | MIDI Setup and Playback |
| Applies to: | Power Tab Editor (1.7) |
| Created: | 04-Sep-2001 |
| Last updated: | 11-Feb-2005 |
| Bug status: | Open |
| Bug severity: | High |
| Revision number: | 10 |
| Author(s): | Brad Larsen |
Symptoms
After pressing the play button, the Editor simply hangs instead of playing the score.
Cause
I've identified this bug as occuring when the song contains a D.S./D.S.S./D.C. al Coda
(or Dbl.Coda) symbol, but the Editor can't find the corresponding To Coda (or To
Dbl Coda) symbol. The following illustrates the problem using the D.S. al Coda symbol:
;
In the above example, we would expect the measures to be played in this
order: 1, 2, 1, 3, 1, 2, 4. The problem occurs during the D.S. al Coda
jumpback to the Segno. After the first measure is played after returning
to the Segno, the Editor needs to determine which Repeat Ending path to take
(either 1. or 2.). Since a DS al Coda/Dbl Coda jump has occured, the
Editor looks for a D.S. indicator in one of the two repeat ending symbols. ;
Since it doesn't find one in the first repeat ending (which is where we want it
to go; that's where the To Coda is located), it jumps to the 2nd repeat
ending. It then runs into the D.S. al Coda again, and jumps back to the
Segno sign at the beginning of the score and the whole process starts
over. The system is caught in an infinite loop!
Resolution
Apply a D.S. indicator to the Repeat Ending that contains the path to
the To Coda symbol. To fix the above example, we need to apply the
D.S. indicator to the 1st repeat ending:
Step - Move the position
indicator (the blue indicator) to the position where the 1st repeat ending is
located:
Step
- While holding down the Ctrl key, click the Repeat Ending button
on the Music Symbols toolbar. The Repeat Ending dialog box will
appear, with data for that repeat ending (notice the 1. is checked):
Step
- Check the D.S. item in the list and press the OK button
The score should now look as follows:
Notice the D.S. indicator beside the 1. now? Since the first repeat ending now
contains a D.S. indicator, the Editor will follows that path after the D.S. al
Coda jump, leading to the To Coda symbol and eventually the jump to the
Coda. This same type of reasoning applies for D.S.S or D.C. jumps.
This bug will be fixed up in the next version of the Editor by determining the best
path if the D.S. indicator is not present in a repeat ending after a D.S. jump.
