Bode frequency shifter, now that is nice. The Moog modular I learned synthesis on had one of those. So how big a modular system do you have? I use to own a model 15 but I sold it about 14 years ago. It paid for two months of fieldwork in Bali that year.
Bali, even nicer.
My system is just a modified model 15 with some additional Moog modules:
the Bode FS, envelope follower, the dual trigger delay and a high pass & coupler (which I've rebuilt into one module)
plus some Aries modules: dual LFO, VC phaser, S/H & noise plus some PAIA modules: 2 ADSRs, VCA, ring mod (surprisingly good),
sequencer and a wizz-bang digital noise module I built from a Polyphony or Craig Anderton article long ago.
It gets much less use these days, but can also be handy as an audio tool box of bits for other gear.
The 921 osc. is an amazing slow LFO to patch here and there, as you'll probably remember.