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pi_audio/instances/adac.md
Me Here f0a07c269d Restructure into a reusable, genericized deploy kit 
Reorganize the repo so it can rebuild the audio hub on any Pi, not just
the live `adac` box:

- README.md: now a project landing page (overview, repo map, deploy
  summary) instead of the adac-specific maintenance guide.
- MAINTENANCE.md: the "how it's wired / day-to-day upkeep" guide,
  genericized with <pi-host>/<pi-ip>/<lan-cidr>/<desktop-host> placeholders.
- config/: the actual PipeWire/WirePlumber drop-ins as deploy-ready
  templates (<VOLT_SOURCE>/<VOLT_SINK>/<LAN_CIDR> placeholders, with the
  commands to resolve them in each file's header comment).
- systemd/bt-agent.service, firmware/config.txt.snippet: the remaining
  deployable artifacts.
- instances/adac.md: the live deployment's real values (host, IP, Volt
  serial, paired phones, history) — the one place machine-specific data
  lives.
- RUNBOOK.md: replace the hardcoded LAN subnet with <lan-cidr>.
- root-README.md: genericized; .gitignore keeps local harness settings out.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
2026-06-15 08:06:03 -05:00

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Instance: adac

The live deployment. Substitute these values for the <placeholders> in RUNBOOK.md, MAINTENANCE.md, and the config/ templates.

Identity & network

Placeholder Value
<pi-host> adac (reachable as adac.local)
<pi-ip> 10.12.10.110 (wired eth0)
<lan-cidr> 10.12.10.0/24
<desktop-host> animal (the desktop; shows up as Tunnel for user@animal streams)
login user user (uid 1000) — the account PipeWire runs under

Audio interface

  • Universal Audio Volt 4 (model 476P), serial 22432056005060, USB, in Pro Audio profile.
  • PipeWire card: alsa_card.usb-Universal_Audio_Volt_476P_22432056005060-00
  • <VOLT_SOURCE> (for 30-mixer-return.conf): alsa_input.usb-Universal_Audio_Volt_476P_22432056005060-00.pro-input-0
  • <VOLT_SINK> (for 40-desktop-34.conf): alsa_output.usb-Universal_Audio_Volt_476P_22432056005060-00.pro-output-0
  • Network advert name (auto-generated from the model): "Volt 476P Pro".

Physical patching

Volt jack Carries Patched to
Outputs 1/2 Phone (Bluetooth) + desktop default audio Mixer channel A
Outputs 3/4 Desktop "Desktop (Volt 3/4)" feed Mixer channel B
Inputs 3/4 Mixer main output (the return → OBS) Mixer main out

Bluetooth phones (paired + trusted)

Name MAC Trusted
Pixel 8 Pro B8:DB:38:79:90:CC yes (2026-06-15)
atomic A4:42:3B:9A:5F:82 yes (2026-06-15)

Notes / history

  • Wi-Fi disabled in firmware (dtoverlay=disable-wifi); the box is wired-only. If the wired link dies it's unreachable until the cable/switch is fixed.
  • A stock filter-chain.service runs but uses the default config and does no custom processing — ignore it; there's no EQ/filter set up.
  • 2026-06-14 "connected but silent" fault: the desktop (animal) tunnel streams arrived muted on the Pi while routing was fine. Fixed with pactl set-sink-input-mute <id> 0. Confirmed it survives reboot. If it recurs, the mute originates on animal — unmute that output device on the desktop.
  • Gain staging is unity end-to-end (all PipeWire stages 0 dB, no Volt hardware attenuation). The desktop volume slider digitally scales the stream feeding the mixer's line input; the mixer fader is the real "hub volume". Leave the desktop at 100% and ride the mixer fader.