Capture works: singing at arm's length reads -34 to -49 dBFS RMS with peaks at
-18 dBFS and no clipping. The earlier all-zero recordings were the HAT's hardware
Audio ON/OFF switch being off; the codec answers on I2C and looks fully
configured either way. Save the stored mixer state (capture +18 dB, input mixer
boost on) in pi/wm8960_asound.state.
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01AFN8nRRCiDiMN7ChBpHJhs
