The .shn is a 4 hp noise source and sample & hold module.
Both pink and white noise are provided in the upper section of the module. the lower section of the module is the sample & hold.
White noise is normalized to the control input of the sample & hold section but that is easily interrupted by inserting a cable to the input jack.
The trigger input results in a transition time of 200 microseconds and it can accept clock oscillations at rates up to 7 khz.