Sensomusic updates Usine to v3.68b

Sensomusic has updated Usine to v3.68b.

Improvements:

• Re-sizable preset panels.
• Snap to grid for containers.

Fixed bugs:

• CC curves 4,5,6,7,8 don't work in the pianoroll.
• The filter panel is not updated in the interface builder.
• The VST version package. The 3.68a was built with an older version of Usine VST.