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One of the really neat things about the 258t is that you don't have to go with the internal signal routing. For example, putting a VCA with a slow rise and fall envelope between the second oscillator's output and the FM input on oscillator 1...this "fades" the FM clang in and out over the duration of the note. A frequency shifter in that same insert would also be quite nuts, plus if you feed its signal into a delay before sending it back to the 258t, you'll get this swirling weirdness of rising FM indices if you can set up a feedback path from the delay and back around through the frequency shifter. You can do this with a pitch shifter, too...the Butthole Surfers really got into that sort of whirly psychedelic bad craziness on both "Rembrandt Pussyhorse" and "Locust Abortion Technician".