The Pattern Save asterisk (*)

One thing I like about the 307 is the little asterisk that appears in the window whenever you've changed a pattern in some way that will be lost if you don't save it. The * reminds me to Pattern Save before doing something else.

But only some changes result in it appearing...Strangely, others do not! Before you grow dependent on this reminder, note the differences.

These actions DO make the asterisk appear:

-Entering/changing note data -- pitch, gate time, etc.
-Making changes in either EDIT mode (Track Edit or Microscope)
-Hitting REC then PLAY (even if you make no actual changes)

While these actions do NOT:

-Adjusting SETUP parameters (Part Mixer, Reverb, Delay, or M-FX settings)
-Altering BPM
-Changing the patch assigned to a part
-Modifying a patch's parameters; these include tweaking the Filter. LFO and Assignable Knobs (in these cases, the asterisk instead appears on the screen for the patch itself)

...A minor issue once you're used to it, but good to know when starting out.