# Two slopes, beating sines Two independently cycling GTS channels make slow acoustic beating after a real mixer. ## Start here Lower the monitoring level before patching. These are documented patch designs, not claims of hardware audition. Unless this recipe uses the right Mix Pro for control voltage: center its DC offset, zero unused channels, and bring up only the cabled audio inputs. Connect Audio Interface MIX OUT to your normal monitoring chain. 1. Set each GTS channel to roughly symmetric rise/fall in the audio range. 2. Match their pitches by ear; balance Mix Pro channels 1 and 2 at a modest level. ## Cables 1. GTS XL upper END OUT → GTS XL upper TRIG IN. 2. GTS XL lower END OUT → GTS XL lower TRIG IN. 3. GTS XL upper SINE → Edelweiss right Mix Pro IN 1. 4. GTS XL lower SINE (AC) → Edelweiss right Mix Pro IN 2. 5. Edelweiss right Mix Pro OUT → Audio Interface AUX IN. ## Listen for A nearly pure sustained tone with slow pulses in loudness as the two frequencies drift apart. ## Play it Detune one FALL control by a tiny amount, then try a fifth instead of unison. ## If it misbehaves If the result is a pair of clicks, raise both slope rates into the audio range. ## Module references - https://serge-modular.com/docs/GTS%20XL%20manual.pdf