Is editing sustain pedal data (Logic Pro 9.1.8) broken?

A number of discussions describe people editing sustain pedal data, some refer to earlier versions than mine (9.1.8).

I can't do it. Searches of "pedal" or "edit MIDI data" don't yield results from the manual, nor does reading whole sections related to software instruments or MIDI.

The little button at the lower left corner of the Piano Roll editor (looks like three dots with lines extending rightward from each) appears to be a multi-mode window for editing MIDI data that isn't notes. The downward arrow at the top of the resulting window frame includes a menu, "Sustain pedal" can be selected. The region displays sustain pedal data from 0-127, with 127 appearing to indicate a "fully depressed" pedal.

However, deleting or changing this data has no impact. For example: my last notes are only a few beats long, but they sustain indefinitely. That sustain is not effected by editing the sustain on the last note, or any note.

My current recording produces an infinite "last chord" -- it doesn't cut off although the note durations are not long. It's strange that (1) any editing to this "pedal info" window makes no impact on whether not.

I've tried setting all levels to zero and all levels to 127, I tried comparing the two settings in a single passage. Nothing makes any difference.

Best,

Ben