How do you invert oscillator output?

I’m using VCO 3 as an LFO and I’m trying to get a sawtooth with a rising back edge.

To obtain an inverted saw you need to AM the original with a negative value.

:sunglasses:

I’m a beginner. Could somebody please describe a patch that does this.

Right.
But most synths don’t feature user acessable bipolar controllable VCAs.