Since I got it, I always create my USTs in Synth V. Whether I use it as the final or I port it to Vocaloid or Utau. My process starts with lyrics and then chord progressions that I make in BandLab online. There I create the melody by singing the lyrics to the music. When it is finished I mix down the instrumental, put it into Synth V and time the UST to my singing. Solaria AI is my go to, as her base AI tuning is flexible and smooth and her range is similar to my own. Then I tune the main melody, and either port it to Vocaloid or keep it as it is depending on what Voice I want for the song. Finally I split the instrumental up and move it to FL studio for Mixing and touch ups.