A very normal connection, they are two euro LFOs that enter the splitter to modulate the two parameters cv capture 1+ 2 inside de DUO
Noted and actually fixed 
Thanks for the suggestion.
oeps sorry, forgot to reply here yesterday!
So when using the CV input in CV mode, damage can only happen when a voltage outside of the specified range is applied (0 to 10V for all units after the limited edition).
When using EXP mode, the DuoX is supplying a voltage either on the tip or ring of the CV in port (depending on the selected setting). In case a mono (TS) cable is inserted when EXP mode is active, there will be a short. The unit has 2 safety mechanisms in place to prevent damage in such cases. The first one turns off this supply voltage whenever a limit of 500mA is exceeded. The second one is that the supply will automatically be turned off when the temperature of the EXP circuit exceeds a set limit.
So its totally safe to use the mono cable you posted above, as long as the EXP mode is not turned on, and even it if was, it should’ve simply turned off
Regarding the splitter cable, are you sure it splits TRS to TS and RS (stereo to 2x mono so to say)? Some cables simply split TRS to 2x TRS, which would explain why you wont get any signal on CV in2. Something like this should work!
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