You may notice some visual changes to KDx, the most obvious of which is the new dynamic links between the envelope time velocity segment control, and its linked time segments.

This change also highlights the new arrow-heads that are attached to some of the link lines to indicate the relationship between linked controls - in this case, the Time/Velocity control influences the amount of the A, D1, D2 and R time segments that are linked.
You can also see that the Center Note control influences the effect of the Key Follow control, and the Depth/Curve control affects Depth/Velocity.

I have also changed some controls that were previously knobs to drop-down menus where there are a small number of options from which to choose. A good example is Filter Type, which used to be a knob that made it somewhat difficult to pick precisely the right option.

Finally, I have increased the brightness of the entire interface, as several people have remarked on its generally dark appearance.
This image shows the new and old colours.

Separately, I have also made changes to the PART selection controls.
Previously, you could select a part and then instantly select another, but due to the way MIDI works, this meant that information if you had selected part X nd then immediately selected part Y, the synth would still be delivering the data for part X while the interface is requesting data for part Y, causing part Y to end up with corrupted data in KDx.
Therefore, when you select a part, the other part buttons are now temporarily disabled until the data for the selected part has finished transmitting, so it is no longer possible to end up with corrupt, partially-loaded parts.

This change also highlights the new arrow-heads that are attached to some of the link lines to indicate the relationship between linked controls - in this case, the Time/Velocity control influences the amount of the A, D1, D2 and R time segments that are linked.
You can also see that the Center Note control influences the effect of the Key Follow control, and the Depth/Curve control affects Depth/Velocity.

I have also changed some controls that were previously knobs to drop-down menus where there are a small number of options from which to choose. A good example is Filter Type, which used to be a knob that made it somewhat difficult to pick precisely the right option.

Finally, I have increased the brightness of the entire interface, as several people have remarked on its generally dark appearance.
This image shows the new and old colours.

Separately, I have also made changes to the PART selection controls.
Previously, you could select a part and then instantly select another, but due to the way MIDI works, this meant that information if you had selected part X nd then immediately selected part Y, the synth would still be delivering the data for part X while the interface is requesting data for part Y, causing part Y to end up with corrupted data in KDx.
Therefore, when you select a part, the other part buttons are now temporarily disabled until the data for the selected part has finished transmitting, so it is no longer possible to end up with corrupt, partially-loaded parts.