That is correct. There currently is not support for Guitar harmonics. You may want to look into a more dedicated sound library like DirecGuitar or Chris Hein Guitar. Someone else like Jim may be able to offer a different alternative with their expertise.
Legacy Forum Post
about 12 years ago
Indeed this isn't a sound we sampled for the basic guitar patch in VDL. You may be able to lower the Low EQ and raise the High EQ to tweak the sound a bit, but that's certainly not the same thing. A more dedicated guitar library will likely give you more control over this sort of thing.