Patch: Fix missing value of Pitch Bend events

[vHeemstra]

• Fixes missing value on certain Pitch Bend events.
• Adds normalized value as well (for ease of use).

References:

• https://www.midi.org/specifications/midi-reference-tables/summary-of-midi-1-0-messages
• https://sites.uci.edu/camp2014/2014/04/30/managing-midi-pitchbend-messages/