Troubles getting multiple effects to run on the same pixel string

[Jim Mc]

Hi all,
I'm working on a project for the upcoming holiday season where I want to use MIDI input to light up many parts of a display, and vary the colors based on notes played.
 
I can successfully create ESEQ effects and can get basic functionality from them, and I've tried FSEC ESEQ's, and I can get those to work individually as well.
 
But here's my problem, I want to run multiple effects at once. (Actually, a lot of individual effects at once.)
 
Here's the simple test scenario where I'm trying to get things proved out first:
 
One Raspberry Pi acts as the MIDI unit. It will use the MIDI plug-in to read music notes, and send commands.
The other Raspberry Pi receives commands from the MIDI unit.
Right now for a test scenario, the receiving Raspberry Pi has a string of 50 pixels on the built-in pi-hat on the Raspberry Pi.
 
In XLights, I set up 4 ESEQ's, each lighting a separate submodel of 12 or 13 pixels in a certain color.  (ESEQ1 sets pixels 1-12 (submodel1) Red, ESEQ2 sets pixels 13-25 (Submodel 2) Green, ESEQ3 sets pixels 26-38 (Submodel 3) Blue, ESEQ4 sets pixels 39-50 (Submodel 4) Yellow). All 4 ESEQs are 10 seconds long. The ideal result is that I can start all 4 of them and light the string up fully. Or, I can light up just the individual sections
 
The problem I run into: If I start an ESEQ, and then start another ESEQ, it blanks out the pixels lit up by the first ESEQ. My question: How do I light up the 4 parts of the string independently, without blanking anything out?
 
I tried FSEQ ESEQ's and got the same result (only plays one at a time, and if I start one before the other finishes, it blanks out the pixels in the first ESEQ).
 
Any help would be greatly appreciated!