docs: add volume, certificate, and reload docs

README.md

@@ -10,6 +10,9 @@ TUI Mumble client with voice support and push-to-talk.
 - Channel browsing and text chat
 - Chat input history (Up/Down arrow navigation)
 - Self-deafen toggle
+- Volume control (input/output gain)
+- Client certificate authentication
+- Config hot-reload (F5)
 
 ## Key Bindings
 
@@ -17,7 +20,10 @@ TUI Mumble client with voice support and push-to-talk.
 |-----|--------|
 | `Tab` | Cycle focus (chat input / channel tree) |
 | `F1` | Toggle self-deafen |
+| `F2` | Cycle output volume |
+| `F3` | Cycle input volume |
 | `F4` | Push-to-talk (configurable) |
+| `F5` | Reload config from disk |
 | `Enter` | Send message / join channel (sidebar) |
 | `Up` | Previous message (input) / previous channel (sidebar) |
 | `Down` | Next message (input) / next channel (sidebar) |
@@ -44,6 +50,12 @@ mkdir -p ~/.config/tuimble
 host = "mumble.example.com"
 port = 64738
 username = "myname"
+# certfile = "/path/to/cert.pem"
+# keyfile = "/path/to/key.pem"
+
+[audio]
+# output_gain = 1.0
+# input_gain = 1.0
 
 [ptt]
 key = "f4"

docs/CHEATSHEET.md

@@ -6,7 +6,13 @@ make run             launch tuimble
 make test            run tests
 make lint            check code style
 
+F1                   toggle self-deafen
+F2                   cycle output volume
+F3                   cycle input volume
+F4                   push-to-talk
+F5                   reload config
+Tab                  cycle focus
+Enter                send message / join channel
+Up/Down              history / channel navigation
 q                    quit
-space                push-to-talk (hold)
-Enter                send message
 ```

docs/DEBUG.md

@@ -38,6 +38,21 @@ groups                           # should include 'input'
 
 Add user to `input` group: `sudo usermod -aG input $USER`
 
+### Certificate errors
+
+If the server requires client certificates:
+
+```sh
+# Verify cert/key pair
+openssl x509 -in cert.pem -noout -subject -dates
+openssl rsa -in key.pem -check -noout
+```
+
+- Both `certfile` and `keyfile` must be PEM-encoded
+- Paths must be absolute or relative to the working directory
+- Key must not be passphrase-protected (pymumble limitation)
+- If the server uses a self-signed CA, pymumble verifies by default
+
 ### Connection refused
 
 - Verify server address and port

docs/USAGE.md

@@ -13,7 +13,10 @@ tuimble --host mumble.example.com --user myname
 |-----|--------|
 | `Tab` | Cycle focus (chat input / channel tree) |
 | `F1` | Toggle self-deafen |
+| `F2` | Cycle output volume |
+| `F3` | Cycle input volume |
 | `F4` | Push-to-talk (configurable) |
+| `F5` | Reload config from disk |
 | `Enter` | Send message / join channel (sidebar) |
 | `Up` | Previous message (input) / previous channel (sidebar) |
 | `Down` | Next message (input) / next channel (sidebar) |
@@ -45,6 +48,41 @@ python3 -m pstats /tmp/tuimble.prof   # interactive explorer
 Note: cProfile captures the main thread only. Background workers
 started with `@work(thread=True)` are not included.
 
+## Volume Control
+
+`F2` and `F3` cycle through volume steps: 0%, 25%, 50%, 75%, 100%,
+125%, 150%, 200%, then back to 0%. Volume is shown in the status bar
+as block indicators.
+
+```toml
+[audio]
+output_gain = 0.75   # 0.0 to 2.0 (default 1.0)
+input_gain = 1.5     # 0.0 to 2.0 (default 1.0)
+```
+
+## Client Certificates
+
+For servers requiring client certificate authentication:
+
+```toml
+[server]
+certfile = "/path/to/client-cert.pem"
+keyfile = "/path/to/client-key.pem"
+```
+
+Both must be PEM-encoded. Leave empty to connect without a certificate.
+
+## Config Reload
+
+`F5` reloads `~/.config/tuimble/config.toml` from disk.
+
+**Safe changes** (applied immediately): PTT key/mode/backend, audio
+gain values.
+
+**Restart-requiring changes** (server settings, audio device/rate):
+shown as warnings. Press `F5` again to confirm reconnect, or any
+other key to cancel.
+
 ## Configuration
 
 See `~/.config/tuimble/config.toml`. All fields are optional;