Sound Magic Updates Imperial Grand to Version 2.1

Sound Magic has Updated Imperial Grand to Version 2.1.

A new Scala Tuning System has been added:

• Add scala format file (.scl files) support for getting different temperaments.
• 4 slots to load scala files.
• Setting for global, center note, start and end note.

Fixes:

• Fixes slow sustain pedal release issue.
• Other minor changes.