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EUROCRACK 
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Q: So... why is a free‑floating cable needed and why is there no hum or interference?
A: The FM CV input jack is normalized. If no patch cable is plugged in, this jack switch is ON and the envelope attack responds to whatever internal envelope is assigned to the Waveshaping Oscillator (green LED). The jack switch is OFF when a patch cable is plugged in and the envelope attack is set to zero for a quick "pluck" sound. Setting the FM attenuator to zero (12 O'Clock) does not change the ON/OFF jack switch setting. re: Interference... users probably won't notice any unless they ground the open end of the free‑floating cable by touching it with their finger (or another ground source). When a patch cable is plugged into the FM CV input jack at J3 (refer to image below), the switch at P2 and P3 is turned off which completely removes R49 (10K) from the circuit. The free‑floating cable breaks the normalization circuit and creates a sharp envelope attack rather than a "portamento" style pitch rise. And yes... the FM pot (FREQ_ATT) is active and is still able to control the pitch. However, for this patch the FM pot is set at the lowest pitch level and that's what gives this sound that Tangerine Dream "hollow and haunting" ambiance 🍊 🍊 🍊 
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