I have got to say, you even simulated the noise, you are correct. I owned a DX100, one of the first synths I ever had. Got it used. Loved the sounds, hated how "noisy" the DAC's were. Incredible that you mimicked the noisy circuit. I chuckled out loud when I googled the solution and then remembered how noisy it sounded when it was recorded. I immediately switched it off and suddenly, the DX100 bass of my dreams, all of the punch, none of the noise!