Noise Source

Noise source and 440Hz reference

Noise Source. This module provides a number of noise types that, on their own range from low-frequency rumble (brown noise) to rushing air (blue noise). Combined with an envelope generator and filter, any number of drum sounds can be synthesised.
The Pink and Brown noises have a lower cut-off frequency of a few Hz, so they can also be used as an LFO source – the brown noise looks more like a slowly wandering voltage, with little content in the audio range.

440Hz Reference. A perfect addition to any synthesiser, enabling fast and accurate tuning of VCO's. Either mixing the VCO output with the 440Hz tone and tuning for no amplitude modulation, or clocking a sample & hold and tuning for zero-frequency, tuning can be trimmed even in a live situation.

When there is no jack inserted into the 440Hz socket the tone is disabled internally to ensure that it cannot interfere with the rest of the instrument.

http://www.liivatera.com/Standard%20Products/Noise/