start with a square wave
use the LFO at about 0.5 Hz to sweep a LPF
use another LFO to sweep the PWM of the square wave at about 0.3 Hz
long decay envelope
feed the lot through 'ensemble' delays
hold a chord - instant swirly-bit EM heaven
thank You very much, i'll try it, have you ever tiried to modulate the pitch with a LFO and to use the resulting wave to modulate the TVA of another oscillator?