Picade X HAT sound volume too high - Picade - Pimoroni Buccaneers
RetroPie Archives - tinkerBOY
On RPI2 with USB sound adapter, ES always reports VolumeControl::init() - Failed to find mixer elements! · Issue #433 · Aloshi/EmulationStation · GitHub
Retro Gaming With RetroPie, GPi CASE 2, and a Raspberry Pi | Navendu Pottekkat