Can I change the default duration for walkout and inning break songs?

[UpAllnite Software]

Yes, you can change the default duration for the walkout song view and the inning break view. 

If you go to the settings applet for your device, you should see an icon for Walkout Song DJ settings.  Tap that icon and it should bring up selectors for the default duration controls.
 
The installation defaults are 11 seconds for walkout songs and 120 seconds between innings, but you can pick a default anywhere from 7-20 seconds for walkouts and 70-160 seconds between innings. 

If you have a need for a value beyond those ranges, please post here and we can try to add that option in future versions.

[Gameon]

How can we set it to play a certain part of the song instead of just the first 10 seconds.

[UpAllnite Software]

The section played for walkout songs defaults to the first ten seconds.

You can change both the start time and the duration by tapping on either the start time (00:00.0) or Duration (00:11.0) column for the song.  That should bring up a cue and duration editing screen that allows you to adjust those values.  The cue/duration screen should be pretty self explanatory, but in simplest form, you can hit the play button and then tap the '[' button at the start of the desired segment and the ']' button at the end.