Possibly due to a synergetic effect of crossbreeding a real stomper like the Raspberry Pi with the fine art of high-end audio design, the publications RPi High-end Audio DAC [1] and the subsequent Volume Control for RPi Audio DAC [2], were both raving successes. But with success come queries.As with any good audio DIY project disseminated through a publication on paper and/or online, users not only flock to buy the boards and play music, but in good engineering spirit also respond with useful feedback. Here is some — be warned, it goes at terrific speed.