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I don't remember how the pulse and triangle waves line up on either the Benjolin or the NLC Dual LFOs, but if the pulse is at the very start of the triangle cycle, you might be able to use the pulse to trigger the random voltage and use the triangle to control the VCA. Even better, trigger two random voltages and use one for pitch and the other to modulate the rate of the LFO. For me the real fun of Krell patches is modulating the rise and fall of a looping envelope, so I'd recommend getting any kind of envelope that has cv control over rise and fall, and the end of cycle trigger makes everything easier too. Cheers and happy patching!