the level knob is your problem i think:
in most cases it must stay at full ccw position! because that’s your level offset! if it’s fully closed then your envelopes are able to open it!!! (controlled by the SHAPE knob).
of course you can offset it.
in envelope mode (first mode) i am able to dial in perfectly snappy envelopes AND use the level knob to willfully distort the output!
i use it to create drums with a VCO (an hertz donut, so a dual complex vco). this is how i do it:
first mode (envelope mode,first led, green light)
CURVE knob fully clockwise (expo curve)
start with level fully ccw
vco sine out to streams input.
my gate signal is multed to excite input AND trig input on maths (or any other snappy function generator).
the out of maths into cv input of vco for pitch envelope
the out of streams to my mixer
MOD knob at noon (no filtering)
SHAPE knob start fully ccw (very closed and snappy and short), then you open it until it sounds good to you
then you can play with the mod knob to filter the sound and with the LEVEL knob to distort your signal. i obtain the best kickdrums with this method.
then i send two other gates to the waveshaper AND the mod input on the hertz donut, twisting the kickdrum to very different percussive sounds, clappy, snare-ish, noisy 
the curve and level knob are VERY important in your STREAMS patches!!!
the only thing i regret is that there is no cv control over his parameters , other than that it is a fantastic module!