If the instruction is not clear or you got any error while building, feel free to ask questions.
# 2. Noise on Synth Output Studio One caused noise on all of my synth plugins. I found that VST 3 SDK example plugin (Note Expression Synth With UI) works without problem. So problem is most likely in my code. I'm not sure I could solve this in near future.
For your infromation, I tested my plugins on VST3PluginTestHost (Steinberg's host), FL, Live, REAPER and Bitwig. Studio One is currently the only DAW which caused this problem.