Module A-118 is a noise and random voltage generator. The A-118 generates the signals white noise, coloured noise, and random voltage. Whilst white and coloured noise can be used both as an audio signal and as a control voltage (in conjunction with an S / H module), the generated random voltage is predominantly used as a control voltage because of the emphasis on the low frequency. The A-118 offers you the possibility to individually adjust the sound colours of the coloured noise by setting the red portion (low frequencies) and the blue portion (high frequencies) separately.
The course of the random voltage, which the rate of change and amplitude you can adjust, is indicated by two LEDs.