Tremolo with fade-in by Martin Kutschker
Tremolo strength is controlled with ATT2.
Fade-in time is controlled with SLEW.
A longer tremolo fade-in (2 o'clock) works nice with a medium filter attack (11 o'clock).
Note that the slew on the MIDI gate adds a kind of repeated delay for very short release times. OTOH the tremolo will be weak for long release times.
Although the LFO is used for the tremolo it can still be used for altering the sound:
ATT2 -> MULT
MULT1 -> SUM 1(B)
MULT2 -> PW1 / SHAPE1
For more havoc modulate the other oscillator randomly:
S&H -> PW2 / SHAPE2