Frap Tools CGM - Gain; Base; Symmetry; Simple Signal Flow

Rev. 5 – Jun 2020 Page 78 of 91
way. They are all in couples (one per each oscillator core)
and located on the back of the PCB.
5.2.1 Gain
This trimmer controls the gain applied to the external
CV patched to the V/oct input. The gain circuit provides
the right scaling of the external CV before it is routed to
the expo converter.
5.2.2 Base
This trimmer regulates the offset that is added to the
exponential conversion of the oscillator’s control volt-
ages. It prevents the response curve from losing linearity
as it gets close to 0, and the oscillator from stalling.
5.2.3 Symmetry
This trimmer regulates the symmetry of the triangle
core, from which all the other waveforms are derived.
6 SIMPLE SIGNAL FLOW
Figure 77: BRENSO’s signal ow.