So I winged it. For the CHORUS, I wanted FEEDBACK control [TYPE – SHIMMER]. You’re going to want to fine tune FEEDBACK & INTENSITY for best results (represented by the expression pedal programming here). Too much gives the CHORUS a reverberant trail. Too little, and you’re going to lose that characteristic sweep.
Here’s a FLANGER variation. Almost the same setup; less INTENSITY. Same lopsided modulation from combining a TRIANGLE SHAPE / MOD SOURCE. Keep the DELAY OFFSET high. It definitely sounds more FLANGER than Symphonic, but you do get that 2-delay combo effect. To the extreme, if desired. TYPE – JET also works well, but it thins out the distorted input a bit too much (being “intensely negative”).