Before applying the plug-in make sure all measures in the score and in the parts
are on the staff system for the final version.
Why? Because the vertical alignment of expressions and hairpins may be different, if a measure is shifted to another system.
The horizontal alignment and spacing might also be handled differently if the measure layout changes.
If you have several staff systems per page, make sure you have them on the correct page as the staff and system spacing will be
optimized (i.e. snap to bottom margin, no collision between staves and systems) during processing and several staff systems will have less space available than only one.
Should you want to change the measure layout afterwards, this is, of course, possible. But you should check the vertical alignment of expressions and hairpins.
It is possible to re-apply the plug-in on single (or multiple) pages, staves or measures. But this is never as good as running the plug-in on the full document as not the whole document data is taken into account.
When you select a staff on a system (i.e. measure 10-13) in the score and process it with the plug-in, it will look good afterwards. But as the plug-in at the same time also processes the data in the linked part, it might worsen the measures in the part if the staff system in the part has other measures that had not been not selected (e.g. measures 9-16).
Of course, you can run the plug-in this way, you only need to be aware to check the parts afterwards.
How Perfect Layout currently changes the measure layout in parts:
The measure layout is based on six rules in PL - both on extracted parts (PL v2 and v3) and linked parts (v3 only):
The parts layout mainly relies on the way you manually set the measures per system before running PL
PL doesn't redo the measure layout per system from scratch.
If you put five measures in Trp.1 system 1 and six measures in Trp.2 system 1 while both have the same notes, PL will keep this and not unify it.
PL doesn't check for best page turns either. Make sure to have page turns at the correct position before running PL.
If you need a certain part style like broadway/musical, Hollywood film music or jazz, make sure to get the measure layout done before running PL (like 4 bars per system, multi-measure rests spanning a whole system, etc.).
The parts layout relies on Finale's music spacing algorithms
plus a bit of its own spacing algorithms (e.g. for chords and multi-layer note collisions).
Music Spacing is only applied to a part if one of the options under "Optimize->Options Spacing Settings" is activated and true for that part.
This means the music spacing will be either applied:
- always ("Always Apply Music (Re-)Spacing) or
- if there any chord symbols are found or
- if major spacing settings change with the "Optimize->Optimize Spacing Settings" option.
PL can shift measures to the previous/next system
if there are horizontal collisions otherwise (especially between chords or tempo mark expressions).
But this is only performed if "Reflow Across Systems" is activated in Finale's preferences or if the measure layout has been redone significantly in PL (e.g. if no multi-measure rests had been created before running PL and there are many multi-measure rests in that part which would affect most systems).
PL can shift a new section start to the previous or next system
if it has a preceding double barline and if it's the first or last measure of the current system
(Option: "Systems->Shift Single Measure with Double Barline ('New Section') to Previous or Next System
"). It will only be shifted in parts and only if there is sufficient horizontal space after shifting (i.e. the horizontal stretch value after the shift must be at least above 0.95).
A repeat bar is the same as a double barline. In some cases it doesn't shift the measure (e.g. a rehearsal or tempo mark in the next or a single measure with a wide crescendo after a multi-measure rest that leads into a new section after the barline).
To enable this feature you also need to activate "Reflow Across Systems
" in Finale's preferences.
This feature was added in PL v3.0055.
If the final system has only one (narrow) measure or multi-measure rest, PL can shift the final measure to the previous system
if there is sufficient space on that system.
If PL detects coda measures in the score (either with coda expressions or with repeat text elements), it will start a new system in the parts with this coda measure.
Additionally the coda system can get an increased vertical distance to the previous system to make the start of the coda more obvious (Systems->Shift Coda System Down by