Sustain pedal is working perfectly! Thanks so much. For those who are looking for a piano-like sustain, try this:
1. Set volume envelope sustain to 0
2. Set vol env attack to 0
3. Set vol env attack to 0
4. Play with vol env decay while holding a key down until it plays to 0 volume
5. Once happy with how the "sustained" sound will play, tweak release for "non-sustained" notes
6. Tweak attack if desired
This will result in a piano-like play experience. Anything above 0 sustain will simply result in a held note at the sustain volume. If release is set too low, releasing the sustain pedal may result in an unnatural sounding stop to the sound. Consider the recommended steps a starting point.
This is basic sound design, I know, but most factory patches have a sustain level above 0, so won't have that natural pedal sound (that those asking for pedal support are probably looking for) out of the box.
Thanks again. Hope this helps elaborate on the fix for people looking for this functionality!