Divebombs like the BOSS PS-6 ... possible with the Kemper?

On the KPA, the Morph parameter can be used to change one or more variable values. It can do more than blend from one sound to another.

If you are morphing the amount of pitch shift, it will smoothly change the pitch (Offhand, I don't remember the maximum time setting for the morph to take place).

As an aside, if you WANTED to use morph to crossfade from normal to pitch shifted sounds, you would morph the mix control, not the pitch amount.

You don't need an expression pedal. All you need is a switch that you set to Morph. This way you can trigger the morphing with a preset duration (seperate time values possible for morphing back and forth).

What foot pedal controller are you using with the KPA?

I think you can use one of your FCB pedals for Morph, if you use one of the KPA's Pedal Mapping modes (see Pedal Set Up in the manual).

If if you can assign a MIDI CC number to a switch with the UNO software, you can assign a Morph switch.

Check the vinyl stop effect with a pedal.

Or the answer is:
WLPF Touch (Wah Low Pass)
Manual: 0.0 | Peak: 10.0 or what you prefer | Pedal Range: 100% | Peak Range 0.0 + X | Pedal Mode: all but not Touch | Mix: 100% | Ducking: 0.0 | Volume: 0.0
So you can use the Wah Pedal as Wah. In the way of @Ingolf you have to lock Wah Pedal to Pitch. But this is a global option and you can't use your WahWah no more. Or you buy a new 3rd pedal for pitch.
Check it out!

@skyrocker
1.) What's your Pedal?
2.) Change the Pedal Mode to another position than touch. At first that was my mistake, too.

Ok. Now I understand. But I don't use beta-versions. And I think it is better to handle this with a pedal. For that reason because you can use the pedal also many other important functions. You'll realize that expands the potential of Kempers immediately by 30%. Pedals are already available for € 20-30. Cheap pedales.

You need to do this:

1. Activate "MorphPedal >Pitch" in System Settings in order to link pedal pitch effects to Morphing controller (applies for Morph Pedal as well as buttons)
2. Activate "Rig Button Morph" in System Settings. Otherwise the Rig buttons of the Remote would reload the Rig instead of initiate Morphing.
3. Select Pedal Pitch or Pedal Vinyl Stop and configure in a Rig.
4. Set Rise Time and Fall Time in Rig Settings as you wish and store the Rig.

Now subsequent hits of the Remote's Rig Buttons will not only simulate the moves of a Morphing Pedal, but also trigger the Pitch Pedal linked to it.
I prefer that method especially for those time bomb effects as it is much more precise than moving any pedal.

I suggest to install 4.0.4 upfront. Earlier revisions have an issue with accidental Rise and Fall Times.