# 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.