Pre

The Pre module allows the embedding of signals from electro dynamic sound sources such as microphones or pickups (e.g. from e-guitars) in modular synthesizer equipment. Its high amplification together with a very low noise floor and high impedance allows the processing of even very low input signals (such as from dynamic microphones) and/or high impedance pickup outputs (e.g. from piezos).
The module is equipped with a ‘Sensitivity’ knob for adaption to different input levels, coming from different pickups or microphones. A red LED indicates when the level is becoming overdriven, causing a saturated output signal; here the preamp will show soft-clipping behaviour.
On the back of the module there is a trimmer for setting the max. output gain – between 3Vpp and 18Vpp. Further, there is a jumper for optionally powering an electret microphone with +12V supply (which will be provided on the 1/4′ jack middle ring).
A second minijack input is above the main jack, which may replace the the 1/4′ jack input. It can be used to combine the Pre with signal sources from other eurorack modules (e.g. for distortion) and will be switched off when the main input jack is in use.