Sonar HS 6..
I have hundreds of song tracks, but one has this Chr and Rev thing in it.  Help files do not have anything about it.  What are these?  Also, the volume is set to 67+.  What is the + sign for?  And the final question:  Why is my Yamaha Motif rack playing at volume 38 instead of 67?
 
 
 
 

You are in Offset Mode. It's tricky to find in the Help files.
In Help, click the Index tab, and type in "Offset Mode". This will bring up the info you are looking for.
Essentially, it created a relative base reference point for the track. It's not particularly difficult to engage it by accident. Anytime you see the + sign, it indicates offset mode.

Chorus and reverb.