[dominotw]

I would really like the equivalent of Unity in the DAW world. Let me script modulators/sound design while doing arrangement/mixing and stuff in UI.

[kennywinker]

Logic Pro X has MIDI Scripters, which might do some of what you're looking for, while still being a traditional DAW. Saw a video the other day of Brian Eno describing how he takes a regular drum beat, and adds a stack of Scriptors to it to make it probabilistic and ever-changing.

[efnx]

In that case you may really like reaktor. I'm pretty sure it integrates with reason and you can do graphical or C programming for it.

[peterrudenko]

Or Bitwig Studio - it has controller scripting API.

[RickS]

max/msp might be of interest, then: https://cycling74.com/products/max/

[blacksmith_tb]

And/or PD (pure data)[1] which is its FOSS cousin.

1: http://puredata.info/

[tomduncalf]

Max for Live is probably particularly relevant here, as you get the full compositional power of Live, plus the flexibility of Max/MSP