Think I solved it - https://github.com/christophhart/HISE/pull/282

@d-healey discovered that some time ago in raw api. Commented as // Not needed anymore

@Casey-Kolb Just came back to this for another project and figured I'd try to make it work using your idea. I found the missing piece of the puzzle. You must include the floating tile type.

const tileData = { "Type":"AHDSRGraph", "ProcessorId": "sampler1GainAHDSR", "Index": -1 };