Mod control - continuous, smooth variation from min to max

[timg11]

I'm trying to bring back some of my favorite sounds from the physical Chroma. One of them hasn't sounded right on the physical Chroma's even after repairing and re-capping the voice cards. I wanted to try it out on Cherry Chroma. It doesn't have a name of course, I just know it as "42" from my working program bank in those days. It's a filter sweep that is controlled by the Mod lever. I play it by holding sustain down, pulling the Mod lever fully down, and playing E1, E2, B2, E3, F#3, B3, F#4, B4. Then slowly sweep up Mod across its full range and back. Here's a clip from a 1985 recording that used it.

I noticed when I used the mod wheel from my Kronos to control Cherry Chroma's Mod by MIDI, it only moved positive, so I couldn't start the sound with the filters closed.
Looking at the data in MidiOx, I found the Kronos sends Modulation (CC 1) for moving the control up, and Breath (CC 2) for moving the control down).
I found in the CA help "That said, it can output negative values either by moving the control with onscreen with the mouse/trackpad, or by assigning a different hardware MIDI controller (by right-clicking, selecting MIDI Learn, and moving the desired controller). "

So I used MIDI Learn to learn Mod Slider with CC2. To get it to work on the negative side, I had to set Min to 50% and Max to 0.
This is close, but there is a "dead zone" near the middle, where I'm moving the controller but the Chroma is not changing so I can't get a smooth sweep. The Mod lever on the physical Chroma is continuous (as far as I recall) This dead zone appears to be the nature of the Kronos as a controller (I see a pause in MidiOx data as I cross the middle), but I'm looking for a workaround. Is there a way to map another controller or knob to Mod so that the full range can be controlled by a single parameter, so the middle range can be smoothly controlled?

[Paul Grooveside]

Your clip is a lovely sound, and an extract of a nice track.

Would you care to share the sound with us as a Cherry Chroma saved patch, please?

I'd also like to hear the whole track if it's online anywhere?

[timg11]

@Paul Grooveside, glad you liked the patch and track.Sorry for the delay - I've been busy and just getting back to looking at the Cherry Chroma.
I put my Chroma patches (in Sysex format) here: https://www.synthify.com/ChromaticArchive/Chroma/
The sweeping filter patch from the audio clip is 42 in set "T1NEW". You can install the sysex file patches in Cherry Chroma by drag and drop.
Note that many of my patches make no sound in the Cherry Chroma. I'm not sure why - I'll ask the Cherry team to have a look. It might be due to my using the Output Select (parameter 5 on real Chroma) for pseudo-stereo for many patches. Cherry ignores output select.
I also put the full composition "Damien.mp3" in the same place. It was made using Chroma and DX-7 in addition to acoustic instruments.