I haven't got an E352, but I do have Plaits and use it with the BSP. Pick either the yellow or the green sequencer. At the back, you will find "pitch", which goes into the Plaits V/Oct. And the trigger goes into the trigger. That's the basic setup. It works well with e.g. the resonance modes ("mini-Rings"). You can adjust some parameters by long-pushing the left button. See the manual for more info.
You can also patch the trigger to an envelope generator, as with analog VCOs that don't have triggers themselves. You can use the velocity to modify parameters, e.g. the timbre or the harmonics. But I don't find that very easy to do with the BSP as the pads aren't very accurate for velocity, so you'll have to use those knobs at the top to correct it all.