I sampled my Moog Etherwave Theremin with various different pitches and timbres to create bass, pad, and lead sounds. Each patch was made by mixing together 3 different samples to get a fuller sound. All the patches vary a bit in pitch over time due to the difficulty of maintaining a fixed pitch on the Theremin. So, they may not be ideal for all uses, but it does give them a bit of a spooky aesthetic. I show the sampling process here: https://youtu.be/ZmKZLe7IlwQ