Fix handling of MMD2/3 instrument default pitch

The default pitch should be used only if not zero. Value 25 means C-3.

Signed-off-by: Claudio Matsuoka <cmatsuoka@gmail.com>
Fix instrument name reading in MMD modules

Signed-off-by: Claudio Matsuoka <cmatsuoka@gmail.com>
[test] Fix MMD instrument names

Signed-off-by: Claudio Matsuoka <cmatsuoka@gmail.com>
Read MED annotations

Signed-off-by: Claudio Matsuoka <cmatsuoka@gmail.com>
Update changelog

Signed-off-by: Claudio Matsuoka <cmatsuoka@gmail.com>