that circuit does appear to be kinda messy tho. I hope someone more knowledgeable will correct me if what im saying is wrong, but i dont really see the point in using R2 and R3, especially considering the Noise R2 might add. I also dont really understand the reason for C2 to be there (maybe some kinda low-pass against high frequency stuff?) The first buffer also just introduces more unnecessary noise, as the following stage should be sufficient. Then again im still a beginner so what im saying might be utter nonsene...