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I'm on a tiny 98hp rack and I'd also argue that you probably won't have much joy from a 64hp ambient machine and wonder where you'd get two usefull stereo signals out of it to cue your mix...

But for the threads names sake and anyone else looking for an output module with stereo cue, Bastl Instruments to the rescue:
https://www.modulargrid.net/e/bastl-instruments-ciao-black

From the module description:
4 high quality line outputs for your modular in compact format. With line level clipping indication is handy for both recording and live. Headphone output can be quickly switched to listen to one of the stereo channels. It is also great for jamming because you can separately create a sound on your headphones and then flip a switch to mix it into the final mix directly with this module.

Best luck and fun with your ambient rack!