Check the listing for details. SSF IMPULSE DYNAMICS : NEW : [DETROIT MODULAR]. Condition: New. Listed at 199.00 USD. However, achieving this utility within the modular ecosystem has not been streamlined into a single module, until now. The digital VCA is triggered whenever the signal patched into TRIG or EXT IN (via normalization) exhibits a positive zero crossing, which then synchronously samples the CV patched into the LEVEL input.