Testing the Hard Sync function of the Thomas Henry X-4046 VCO. This VCO is known for having the best Hard Sync sound of any VCO out there (according to the Birth of a Synth website) and I must admit it sounds pretty awesome. This VCO paired with the State Variable filter is a killer combination. The VCO is being synced by a sawtooth wave from the TH 555 VCO.
