Overhaul to keycode related docs

* Adds Audio Keycodes to both the feature page and master list
* Re-orders the keycode list, so it's alphabetical (mostly)
* Add additional (missing) sections to the keycode list
* Add and update links in the keycode page
* Add and reorder links in sidebar's keycode section

5 files changed, 160 insertions, 90 deletions

diff --git a/docs/_summary.md b/docs/_summary.md
index 318c526a8..1a379b2ad 100644
--- a/docs/_summary.md
+++ b/docs/_summary.md
@@ -53,18 +53,22 @@
   * [Userspace](feature_userspace.md)
 
 * [Keycodes](keycodes.md)
-  * [Backlight](feature_backlight.md#backlight-keycodes)
   * [Basic](keycodes_basic.md)
-  * [Bluetooth](feature_bluetooth.md#bluetooth-keycodes)
+  * [Quantum](quantum_keycodes.md)
+  * [Audio](feature_audio.md#audio-keycodes)
+  * [Backlight](feature_backlight.md#backlight-keycodes)
   * [Bootmagic](feature_bootmagic.md#bootmagic-keycodes)
+  * [Bluetooth](feature_bluetooth.md#bluetooth-keycodes)
   * [Layer Switching](feature_advanced_keycodes.md#switching-and-toggling-layers)
   * [Mod+Key](feature_advanced_keycodes.md#modifier-keys)
   * [Mod Tap](feature_advanced_keycodes.md#mod-tap)
+  * [Mouse Keys](feature_mouse_keys.md#mapping-mouse-actions-to-keyboard-keys)
   * [One Shot Keys](feature_advanced_keycodes.md#one-shot-keys)
-  * [Quantum](quantum_keycodes.md)
   * [RGB Light](feature_rgblight.md#rgblight-keycodes)
+  * [RGB Matrix](feature_rgb_matrix.md#keycodes)
   * [Shifted Keys](feature_advanced_keycodes.md#shifted-keycodes)
   * [Stenography](feature_stenography.md#keycode-reference)
+  * [Swap Hands](feature_swap_hands.md#swap-keycodes)
   * [Thermal Printer](feature_thermal_printer.md#thermal-printer-keycodes)
   * [US ANSI Shifted Keys](keycodes_us_ansi_shifted.md)
 
diff --git a/docs/config_options.md b/docs/config_options.md
index 42b6060d6..94233cadc 100644
--- a/docs/config_options.md
+++ b/docs/config_options.md
@@ -126,14 +126,18 @@ If you define these options you will enable the associated feature, which may in
   * how long before a tap becomes a hold, if set above 500, a key tapped during the tapping term will turn it into a hold too
 * `#define RETRO_TAPPING`
   * tap anyway, even after TAPPING_TERM, if there was no other key interruption between press and release
+  * See [Retro Tapping](feature_advanced_keycodes.md#retro-tapping) for details
 * `#define TAPPING_TOGGLE 2`
   * how many taps before triggering the toggle
 * `#define PERMISSIVE_HOLD`
   * makes tap and hold keys work better for fast typers who don't want tapping term set above 500
+  * See [Permissive Hold](feature_advanced_keycodes.md#permissive-hold) for details
 * `#define IGNORE_MOD_TAP_INTERRUPT`
   * makes it possible to do rolling combos (zx) with keys that convert to other keys on hold
+  * See [Mod tap interrupt](feature_advanced_keycodes.md#mod-tap-interrupt) for details
 * `#define TAPPING_FORCE_HOLD`
   * makes it possible to use a dual role key as modifier shortly after having been tapped
+  * See [Hold after tap](feature_advanced_keycodes.md#hold-after-tap)
 * `#define LEADER_TIMEOUT 300`
   * how long before the leader key times out
 * `#define ONESHOT_TIMEOUT 300`
diff --git a/docs/feature_advanced_keycodes.md b/docs/feature_advanced_keycodes.md
index a4b681ec1..f03a7121c 100644
--- a/docs/feature_advanced_keycodes.md
+++ b/docs/feature_advanced_keycodes.md
@@ -203,3 +203,9 @@ With default settings, `a` will be sent on the first release, then `a` will be s
 With `TAPPING_FORCE_HOLD`, the second press will be interpreted as a Shift, allowing to use it as a modifier shortly after having used it as a tap.
 
 !> `TAPPING_FORCE_HOLD` will break anything that uses tapping toggles (Such as the `TT` layer keycode, and the One Shot Tapping Toggle).
+
+# Retro Tapping
+
+When you hold a dual function key, and haven't pressed anything when you release the key, normally nothing happens.  However, if you enable this, if you release the key without pressing another key, it will send the original key, even if it is outside of the tapping term. 
+
+For instance, if you're using `LT(2, KC_SPACE)`, if you hold the key, don't hit anything else and then release it, normally, nothing happens. But with `RETRO_TAPPING` defined in your `config.h`, it will send `KC_SPACE`. 
diff --git a/docs/feature_audio.md b/docs/feature_audio.md
index 50e389605..039c62cdf 100644
--- a/docs/feature_audio.md
+++ b/docs/feature_audio.md
@@ -3,6 +3,7 @@
 Your keyboard can make sounds! If you've got a Planck, Preonic, or basically any AVR keyboard that allows access to certain PWM-capable pins, you can hook up a simple speaker and make it beep. You can use those beeps to indicate layer transitions, modifiers, special keys, or just to play some funky 8bit tunes.
 
 Up to two simultaneous audio voices are supported, one driven by timer 1 and another driven by timer 3.  The following pins can be defined as audio outputs in config.h:
+
 Timer 1:
 `#define B5_AUDIO`
 `#define B6_AUDIO`
@@ -58,6 +59,13 @@ PLAY_LOOP(my_song);
 
 It's advised that you wrap all audio features in `#ifdef AUDIO_ENABLE` / `#endif` to avoid causing problems when audio isn't built into the keyboard.
 
+The available keycodes for audio are: 
+
+* `AU_ON` - Turn audio mode on
+* `AU_OFF` - Turn audio mode off
+* `AU_TOG` - Toggle audio mode
+
+
 ## Music Mode
 
 The music mode maps your columns to a chromatic scale, and your rows to octaves. This works best with ortholinear keyboards, but can be made to work with others. All keycodes less than `0xFF` get blocked, so you won't type while playing notes - if you have special keys/mods, those will still work. A work-around for this is to jump to a different layer with KC_NOs before (or after) enabling music mode.
@@ -145,6 +153,23 @@ You can configure the default, min and max frequencies, the stepping and built i
 
 This is still a WIP, but check out `quantum/keymap_midi.c` to see what's happening. Enable from the Makefile.
 
+
+## Audio Keycodes
+
+|Key             |Aliases  |Description                       |
+|----------------|---------|----------------------------------|
+|`AU_ON`         |         |Audio mode on                     |
+|`AU_OFF`        |         |Audio mode off                    |
+|`AU_TOG`        |         |Toggles Audio mode                |
+|`CLICKY_TOGGLE` |`CK_TOGG`|Toggles Audio clicky mode         |
+|`CLICKY_UP`     |`CK_UP`  |Increases frequency of the clicks |
+|`CLICKY_DOWN`   |`CK_DOWN`|Decreases frequency of the clicks |
+|`CLICKY_RESET`  |`CK_RST` |Resets frequency to default       |
+|`MU_ON`         |         |Turns on Music Mode               |
+|`MU_OFF`        |         |Turns off Music Mode              |
+|`MU_TOG`        |         |Toggles Music Mode                |
+|`MU_MOD`        |         |Cycles through the music modes    |
+
 <!-- FIXME: this formatting needs work
 
 ## Audio
diff --git a/docs/keycodes.md b/docs/keycodes.md
index b15fb62a0..1dc378caf 100644
--- a/docs/keycodes.md
+++ b/docs/keycodes.md
@@ -191,27 +191,6 @@ This is a reference only. Each group of keys links to the page documenting their
 |`KC_NO`                |                    |Ignore this key (NOOP)                         |
 |`KC_TRANSPARENT`       |`KC_TRNS`           |Use the next lowest non-transparent key        |
 
-## [Mouse Keys](feature_mouse_keys.md)
-
-|Key             |Aliases  |Description                |
-|----------------|---------|---------------------------|
-|`KC_MS_UP`      |`KC_MS_U`|Mouse Cursor Up            |
-|`KC_MS_DOWN`    |`KC_MS_D`|Mouse Cursor Down          |
-|`KC_MS_LEFT`    |`KC_MS_L`|Mouse Cursor Left          |
-|`KC_MS_RIGHT`   |`KC_MS_R`|Mouse Cursor Right         |
-|`KC_MS_BTN1`    |`KC_BTN1`|Mouse Button 1             |
-|`KC_MS_BTN2`    |`KC_BTN2`|Mouse Button 2             |
-|`KC_MS_BTN3`    |`KC_BTN3`|Mouse Button 3             |
-|`KC_MS_BTN4`    |`KC_BTN4`|Mouse Button 4             |
-|`KC_MS_BTN5`    |`KC_BTN5`|Mouse Button 5             |
-|`KC_MS_WH_UP`   |`KC_WH_U`|Mouse Wheel Up             |
-|`KC_MS_WH_DOWN` |`KC_WH_D`|Mouse Wheel Down           |
-|`KC_MS_WH_LEFT` |`KC_WH_L`|Mouse Wheel Left           |
-|`KC_MS_WH_RIGHT`|`KC_WH_R`|Mouse Wheel Right          |
-|`KC_MS_ACCEL0`  |`KC_ACL0`|Set mouse acceleration to 0|
-|`KC_MS_ACCEL1`  |`KC_ACL1`|Set mouse acceleration to 1|
-|`KC_MS_ACCEL2`  |`KC_ACL2`|Set mouse acceleration to 2|
-
 ## [Quantum Keycodes](quantum_keycodes.md#qmk-keycodes)
 
 |Key          |Aliases    |Description                                                          |
@@ -227,6 +206,36 @@ This is a reference only. Each group of keys links to the page documenting their
 |`M(n)`       |           |Call macro `n`                                                       |
 |`MACROTAP(n)`|           |Macro-tap `n` idk FIXME                                              |
 
+## [Audio Keys](feature_audio.md)
+
+|Key             |Aliases  |Description                       |
+|----------------|---------|----------------------------------|
+|`AU_ON`         |         |Audio mode on                     |
+|`AU_OFF`        |         |Audio mode off                    |
+|`AU_TOG`        |         |Toggles Audio mode                |
+|`CLICKY_TOGGLE` |`CK_TOGG`|Toggles Audio clicky mode         |
+|`CLICKY_UP`     |`CK_UP`  |Increases frequency of the clicks |
+|`CLICKY_DOWN`   |`CK_DOWN`|Decreases frequency of the clicks |
+|`CLICKY_RESET`  |`CK_RST` |Resets frequency to default       |
+|`MU_ON`         |         |Turns on Music Mode               |
+|`MU_OFF`        |         |Turns off Music Mode              |
+|`MU_TOG`        |         |Toggles Music Mode                |
+|`MU_MOD`        |         |Cycles through the music modes    |
+
+
+
+## [Backlighting](feature_backlight.md)
+
+|Key      |Description                               |
+|---------|------------------------------------------|
+|`BL_TOGG`|Turn the backlight on or off              |
+|`BL_STEP`|Cycle through backlight levels            |
+|`BL_ON`  |Set the backlight to max brightness       |
+|`BL_OFF` |Turn the backlight off                    |
+|`BL_INC` |Increase the backlight level              |
+|`BL_DEC` |Decrease the backlight level              |
+|`BL_BRTG`|Toggle backlight breathing                |
+
 ## [Bootmagic](feature_bootmagic.md)
 
 |Key                               |Aliases  |Description                         |
@@ -251,17 +260,88 @@ This is a reference only. Each group of keys links to the page documenting their
 |`MAGIC_UNSWAP_ALT_GUI`            |`AG_NORM`|Unswap Alt and GUI on both sides    |
 |`MAGIC_TOGGLE_NKRO`               |         |Turn NKRO on or off                 |
 
-## [Backlighting](feature_backlight.md)
+## [Bluetooth](feature_bluetooth.md)
 
-|Key      |Description                               |
-|---------|------------------------------------------|
-|`BL_TOGG`|Turn the backlight on or off              |
-|`BL_STEP`|Cycle through backlight levels            |
-|`BL_ON`  |Set the backlight to max brightness       |
-|`BL_OFF` |Turn the backlight off                    |
-|`BL_INC` |Increase the backlight level              |
-|`BL_DEC` |Decrease the backlight level              |
-|`BL_BRTG`|Toggle backlight breathing                |
+|Key       |Description                                   |
+|----------|----------------------------------------------|
+|`OUT_AUTO`|Automatically switch between USB and Bluetooth|
+|`OUT_USB` |USB only                                      |
+|`OUT_BT`  |Bluetooth only                                |
+
+
+## [Layer Switching](feature_advanced_keycodes.md# Switching and Toggling Layers)
+
+|Key         |Description                                                               |
+|-----------------|---------------------------------------------------------------------|
+|`DF(layer)`      |Switches the default layer                                           |
+|`MO(layer)`      |Momentarily activates layer, switches off when you let go            |
+|`LM(layer, mod)` |As `MO(layer)` but with `mod` active                                 |
+|`LT(layer, kc)`  |Momentarily activates layer if held, sends kc if tapped              |
+|`TG(layer)`      |Toggles the layer (enables it if no active, and vise versa)          |
+|`TO(layer)`      |Activates layer and deactivates all other layers                     |
+|`TT(layer)`      |Momentarily activates layer if held, toggles it if tapped repeatedly |
+
+## [Mouse Keys](feature_mouse_keys.md)
+
+|Key             |Aliases  |Description                |
+|----------------|---------|---------------------------|
+|`KC_MS_UP`      |`KC_MS_U`|Mouse Cursor Up            |
+|`KC_MS_DOWN`    |`KC_MS_D`|Mouse Cursor Down          |
+|`KC_MS_LEFT`    |`KC_MS_L`|Mouse Cursor Left          |
+|`KC_MS_RIGHT`   |`KC_MS_R`|Mouse Cursor Right         |
+|`KC_MS_BTN1`    |`KC_BTN1`|Mouse Button 1             |
+|`KC_MS_BTN2`    |`KC_BTN2`|Mouse Button 2             |
+|`KC_MS_BTN3`    |`KC_BTN3`|Mouse Button 3             |
+|`KC_MS_BTN4`    |`KC_BTN4`|Mouse Button 4             |
+|`KC_MS_BTN5`    |`KC_BTN5`|Mouse Button 5             |
+|`KC_MS_WH_UP`   |`KC_WH_U`|Mouse Wheel Up             |
+|`KC_MS_WH_DOWN` |`KC_WH_D`|Mouse Wheel Down           |
+|`KC_MS_WH_LEFT` |`KC_WH_L`|Mouse Wheel Left           |
+|`KC_MS_WH_RIGHT`|`KC_WH_R`|Mouse Wheel Right          |
+|`KC_MS_ACCEL0`  |`KC_ACL0`|Set mouse acceleration to 0|
+|`KC_MS_ACCEL1`  |`KC_ACL1`|Set mouse acceleration to 1|
+|`KC_MS_ACCEL2`  |`KC_ACL2`|Set mouse acceleration to 2|
+
+## [Modifiers](feature_advanced_keycodes.md#modifier-keys)
+
+|Key       |Aliases               |Description                                         |
+|----------|----------            |----------------------------------------------------|
+|`KC_HYPR` |                      |Hold Left Control, Shift, Alt and GUI               |
+|`KC_MEH`  |                      |Hold Left Control, Shift and Alt                    |
+|`LCTL(kc)`|                      |Hold Left Control and press `kc`                    |
+|`LSFT(kc)`|`S(kc)`               |Hold Left Shift and press `kc`                      |
+|`LALT(kc)`|                      |Hold Left Alt and press `kc`                        |
+|`LGUI(kc)`|`LCMD(kc)`, `LWIN(kc)`|Hold Left GUI and press `kc`                        |
+|`RCTL(kc)`|                      |Hold Right Control and press `kc`                   |
+|`RSFT(kc)`|                      |Hold Right Shift and press `kc`                     |
+|`RALT(kc)`|                      |Hold Right Alt and press `kc`                       |
+|`RGUI(kc)`|`RCMD(kc)`, `LWIN(kc)`|Hold Right GUI and press `kc`                       |
+|`HYPR(kc)`|                      |Hold Left Control, Shift, Alt and GUI and press `kc`|
+|`MEH(kc)` |                      |Hold Left Control, Shift and Alt and press `kc`     |
+|`LCAG(kc)`|                      |Hold Left Control, Alt and GUI and press `kc`       |
+|`ALTG(kc)`|                      |Hold Right Control and Alt and press `kc`           |
+|`SGUI(kc)`|`SCMD(kc)`, `SWIN(kc)`|Hold Left Shift and GUI and press `kc`              |
+|`LCA(kc)` |                      |Hold Left Control and Alt and press `kc`            |
+
+## [Mod-Tap Keys](feature_advanced_keycodes.md#mod-tap)
+
+|Key         |Aliases                                |Description                                            |
+|------------|---------------------------------------|-------------------------------------------------------|
+|`LCTL_T(kc)`|`CTL_T(kc)`                            |Left Control when held, `kc` when tapped               |
+|`RCTL_T(kc)`|                                       |Right Control when held, `kc` when tapped              |
+|`LSFT_T(kc)`|`SFT_T(kc)`                            |Left Shift when held, `kc` when tapped                 |
+|`RSFT_T(kc)`|                                       |Right Shift when held, `kc` when tapped                |
+|`LALT_T(kc)`|`ALT_T(kc)`                            |Left Alt when held, `kc` when tapped                   |
+|`RALT_T(kc)`|`ALGR_T(kc)`                           |Right Alt when held, `kc` when tapped                  |
+|`LGUI_T(kc)`|`LCMD_T(kc)`, `RWIN_T(kc)`, `GUI_T(kc)`|Left GUI when held, `kc` when tapped                   |
+|`RGUI_T(kc)`|`RCMD_T(kc)`, `RWIN_T(kc)`             |Right GUI when held, `kc` when tapped                  |
+|`C_S_T(kc)` |                                       |Left Control and Shift when held, `kc` when tapped     |
+|`MEH_T(kc)` |                                       |Left Control, Shift and Alt when held, `kc` when tapped|
+|`LCAG_T(kc)`|                                       |Left Control, Alt and GUI when held, `kc` when tapped  |
+|`RCAG_T(kc)`|                                       |Right Control, Alt and GUI when held, `kc` when tapped |
+|`ALL_T(kc)` |                                       |Left Control, Shift, Alt and GUI when held, `kc` when tapped - more info [here](http://brettterpstra.com/2012/12/08/a-useful-caps-lock-key/)|
+|`SCMD_T(kc)`|`SWIN_T(kc)`                           |Left Shift and GUI when held, `kc` when tapped         |
+|`LCA_T(kc)` |                                       |Left Control and Alt when held, `kc` when tapped       |
 
 ## [RGB Lighting](feature_rgblight.md)
 
@@ -309,55 +389,6 @@ This is a reference only. Each group of keys links to the page documenting their
 |`PRINT_ON` |Start printing everything the user types|
 |`PRINT_OFF`|Stop printing everything the user types |
 
-## [Bluetooth](feature_bluetooth.md)
-
-|Key       |Description                                   |
-|----------|----------------------------------------------|
-|`OUT_AUTO`|Automatically switch between USB and Bluetooth|
-|`OUT_USB` |USB only                                      |
-|`OUT_BT`  |Bluetooth only                                |
-
-## [Modifiers](quantum_keycodes.md#modifiers)
-
-|Key       |Aliases               |Description                                         |
-|----------|----------            |----------------------------------------------------|
-|`KC_HYPR` |                      |Hold Left Control, Shift, Alt and GUI               |
-|`KC_MEH`  |                      |Hold Left Control, Shift and Alt                    |
-|`LCTL(kc)`|                      |Hold Left Control and press `kc`                    |
-|`LSFT(kc)`|`S(kc)`               |Hold Left Shift and press `kc`                      |
-|`LALT(kc)`|                      |Hold Left Alt and press `kc`                        |
-|`LGUI(kc)`|`LCMD(kc)`, `LWIN(kc)`|Hold Left GUI and press `kc`                        |
-|`RCTL(kc)`|                      |Hold Right Control and press `kc`                   |
-|`RSFT(kc)`|                      |Hold Right Shift and press `kc`                     |
-|`RALT(kc)`|                      |Hold Right Alt and press `kc`                       |
-|`RGUI(kc)`|`RCMD(kc)`, `LWIN(kc)`|Hold Right GUI and press `kc`                       |
-|`HYPR(kc)`|                      |Hold Left Control, Shift, Alt and GUI and press `kc`|
-|`MEH(kc)` |                      |Hold Left Control, Shift and Alt and press `kc`     |
-|`LCAG(kc)`|                      |Hold Left Control, Alt and GUI and press `kc`       |
-|`ALTG(kc)`|                      |Hold Right Control and Alt and press `kc`           |
-|`SGUI(kc)`|`SCMD(kc)`, `SWIN(kc)`|Hold Left Shift and GUI and press `kc`              |
-|`LCA(kc)` |                      |Hold Left Control and Alt and press `kc`            |
-
-## [Mod-Tap Keys](quantum_keycodes.md#mod-tap-keys)
-
-|Key         |Aliases                                |Description                                            |
-|------------|---------------------------------------|-------------------------------------------------------|
-|`LCTL_T(kc)`|`CTL_T(kc)`                            |Left Control when held, `kc` when tapped               |
-|`RCTL_T(kc)`|                                       |Right Control when held, `kc` when tapped              |
-|`LSFT_T(kc)`|`SFT_T(kc)`                            |Left Shift when held, `kc` when tapped                 |
-|`RSFT_T(kc)`|                                       |Right Shift when held, `kc` when tapped                |
-|`LALT_T(kc)`|`ALT_T(kc)`                            |Left Alt when held, `kc` when tapped                   |
-|`RALT_T(kc)`|`ALGR_T(kc)`                           |Right Alt when held, `kc` when tapped                  |
-|`LGUI_T(kc)`|`LCMD_T(kc)`, `RWIN_T(kc)`, `GUI_T(kc)`|Left GUI when held, `kc` when tapped                   |
-|`RGUI_T(kc)`|`RCMD_T(kc)`, `RWIN_T(kc)`             |Right GUI when held, `kc` when tapped                  |
-|`C_S_T(kc)` |                                       |Left Control and Shift when held, `kc` when tapped     |
-|`MEH_T(kc)` |                                       |Left Control, Shift and Alt when held, `kc` when tapped|
-|`LCAG_T(kc)`|                                       |Left Control, Alt and GUI when held, `kc` when tapped  |
-|`RCAG_T(kc)`|                                       |Right Control, Alt and GUI when held, `kc` when tapped |
-|`ALL_T(kc)` |                                       |Left Control, Shift, Alt and GUI when held, `kc` when tapped - more info [here](http://brettterpstra.com/2012/12/08/a-useful-caps-lock-key/)|
-|`SCMD_T(kc)`|`SWIN_T(kc)`                           |Left Shift and GUI when held, `kc` when tapped         |
-|`LCA_T(kc)` |                                       |Left Control and Alt when held, `kc` when tapped       |
-
 ## [US ANSI Shifted Keys](keycodes_us_ansi_shifted.md)
 
 |Key                     |Aliases           |Description        |
@@ -396,19 +427,13 @@ This is a reference only. Each group of keys links to the page documenting their
 |`TT(layer)`     |Normally acts like MO unless it's tapped multiple times, which toggles `layer` on |
 |`LM(layer, mod)`|Momentarily turn on `layer` (like MO) with `mod` active as well.                  |
 
-## [One Shot Keys](quantum_keycodes.md#one-shot-keys)
+## [One Shot Keys](feature_advanced_keycodes.md#one-shot-keys)
 
 |Key         |Description                       |
 |------------|----------------------------------|
 |`OSM(mod)`  |Hold `mod` for one keypress       |
 |`OSL(layer)`|Switch to `layer` for one keypress|
 
-## [Unicode Support](feature_unicode.md)
-
-|Key         |Aliases|                                                 |
-|------------|-------|-------------------------------------------------|
-|`UNICODE(n)`|`UC(n)`|Send Unicode character `n`                       |
-|`X(n)`      |       |Send Unicode character `n` via a different method|
 
 ## [Swap Hands](feature_swap_hands.md)
 
@@ -421,3 +446,9 @@ This is a reference only. Each group of keys links to the page documenting their
 |`SH_MOFF`  |Momentarily turns off swap.                                              |
 |`SH_TG`    |Toggles swap on and off with every key press.                            |
 |`SH_TT`    |Toggles with a tap; momentary when held.                                 |
+## [Unicode Support](feature_unicode.md)
+
+|Key         |Aliases|                                                 |
+|------------|-------|-------------------------------------------------|
+|`UNICODE(n)`|`UC(n)`|Send Unicode character `n`                       |
+|`X(n)`      |       |Send Unicode character `n` via a different method|