The module is an inverter for exclusively positive voltages. It inverts an applied positive voltage so that the maximum value becomes zero and zero becomes the maximum value. The input voltage is therefore not inverted into the negative voltage range (mirror axis 0v), but reflects a positive voltage around an adjustable axis within a fixed positive voltage range from 0v. 

There are 10 ranges, adjustable in 1V steps. The mirror axis is always on half of the set range. Negative voltages cannot be inverted with this module. Applied negative voltages are limited to approximately zero volts. 

The module has two identical function groups. Applications are, for example, the inversion within positive voltage ranges, GATE inversions (0/+5v to +5v/0v), or opposing melody lines (in connection with a connected quantizer).

Price : €99

More info about modules flame here:

http://www.flame-instruments.de/flame2/instruments_modular.html