Hi montag, I don’t know if this may help you (3 years later), I don’t even know if this is the way to go. Anyway, I arrived here looking for a guide on creating factory presets.
Looking at the code, I could create VST3 factory presets that are working on Reaper/Windows.
IPlugVST3_Defs.h I added a the following define:
In my plugin’s header I declared the number of presets
const int kNumPresets = 2;
Then in the plugin’s constructor I created the presets after declaring the params.
//... declaring params
GetParam(kStereoLink)->InitBool("Link Channels", false);
GetParam(kLookAhead)->InitBool("Look Ahead", false);
// Factory Presets
// Params in order: kGain, kRatio, kThreshold, kAttackMs, kReleaseMs, kStereoLink, kLookAhead
MakePreset("Bass Attack", 6., 5.4, -20., 30., 300., true, false);
MakePreset("Kick Drum Sustain", 6. , 2.5, -20., 10., 50., true, true);
Hope it helps somebody. If my response is wrong or out of the subject please let me know and I’ll delete it.