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piersholt · Nov 3, 2020 · 1ce69a2 · 1ce69a2
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diff --git a/gt/45.md b/gt/45.md
@@ -2,13 +2,13 @@
 
 GT `0x3b` → Radio `0x68`
 
-Controls radio UI state.
+`0x45` is, for the best part, to manage *when* the radio is in the foreground, and to a lesser extent, *how* it behaves in the foreground.
 
-Used in conjunction with `0x46`.
+It's ostensibly the GT equivalent of `0x20`.
 
 ### Related
 
-- `0x46` [Radio UI](../radio/46.md)
+- `0x46` [Request Radio UI](../radio/46.md)
 
 ### Examples
 
@@ -20,47 +20,51 @@ Used in conjunction with `0x46`.
 
 Single byte bitfield.
 
-    SHOW_RADIO          = 0b0000_0000
-    HIDE_RADIO          = 0b0000_0001
+    FLAG_BACKGROUND     = 0b0000_0001
     FLAG_AUDIO_OBC      = 0b0000_0010
+    FLAG_FIELDS         = 0b0000_1110   # possibly this?
 
     # Only applicable to MK3 (3-1/40+), MK4
     FLAG_NEW_UI         = 0b0001_0000
     FLAG_NEW_UI_HIDE    = 0b1000_0000
 
-### "Foreground" `0b0000_0000`
+### Background `0b0000_0001`
 
-Radio to foreground.
+When set to `1`, the radio will still draw to display on user input i.e. changing radio station, but will relinquish the display after approx. 8 seconds.
 
-This can be sent even if the radio is off, in which case it is ignored by the radio.
+When set to `0`, the radio will presume to stay in the foreground.
 
-### "Background" `0b0000_0001`
+*The GT seems to remember the radio state and will resume the apprprirate display state after an ignition cycle.*
 
-Radio to background.
+### Audio+OBC `0b0000_0010`
 
-The radio will still draw to display on user input i.e. changing radio station, but will return itself to background after approx. 8 seconds.
+See [Audio OBC](#).
 
-### Audio+OBC `0b0000_0010`
+THis is really only of use with the C24 radio which...
 
-See Audio OBC
+Limit/restrict radio drawing menus to allow Audio OBC to remain in foreground. T
 
-Only applicable to older UI.
+The Audio+OBC feature was removed with the updated UI (`3/1-40+`).
 
-Limit/restrict radio drawing menus to allow Audio OBC to remain in foreground.
+Possibly 
 
 ### New UI `0b0001_0000`
 
-Flag to signify the new UI that was introduced in ~2001 (`3-1/40`) . 
+Flag to signify the new UI that was introduced in ~2001 (`3-1/40+`) . 
 
 > The "radio" splitscreen function is only possible with NG *[next generation]* radios (BM53 and BM54 from 03.01).
-> *-- BMW Service Training*
+> /--- BMW Service Training
 
 The inference is that if an NG radio is required to support splitscreen, the new UI is not backwards compatible with legacy radios (C23 BM etc).
 
+*The split screen only works for layouts `0x60..0x7f`...*
+
 A flag that allows the old and new UIs to be differentiated suggests that the NG radios may retain support for the older UI.
 
 ### New UI (On Hide) `0b1000_0000`
 
+Not sure to be honest. This is set when hiding?
+
 Introduced with *New UI* flag.
 
 ## Use Cases
@@ -73,7 +77,7 @@ The GT requesting the radio draw the radio UI at KL-R if the radio was on at ign
 
 ### Main Menu
 
-A MENU press does not get sent to radio, but is broadcast, and instead handled by the GT, which will in turn, message the Radio relinquish (as presumably the radio does not listen for global button )
+A MENU press does not get sent to radio, but is broadcast, and instead handled by the GT, which will in turn, message the Radio relinquish (as presumably the radio does not listen for global button)
 
     gt  rad 45 91 (1001 0001) Info? [ON] Main Menu [ON]
     rad gt  46 01 (0000 0001) Main Menu [ON]
@@ -88,13 +92,15 @@ Note: this is really only relevant to BM24, BM54 as there is no contention in th
 
 ![Audio+OBC](../radio/audio_obc/mk1_gt/audio_obc_enabled.JPG)
 _Audio+OBC: The MK1 GT, and BM53 with the Audio+OBC feature enabled._
-<!--![Audio+OBC](../radio/audio_obc/vm_gt/audio_obc_enabled.JPG)-->
-<!--_Audio+OBC: A video module GT, and BM53 with the Audio+OBC feature enabled._-->
+
+
+![Audio+OBC](../radio/audio_obc/vm_gt/audio_obc_enabled.JPG)
+_Audio+OBC: The Video Module GT, and BM53 with the Audio+OBC feature enabled._
 
 The bit is set/unset when "Audio+OBC" is enabled/disabled via the "Set" menu. It prevents (_or possibly makes menus a timeout?_) the radio from rendering any menus, thus the OBC remains in the foreground.
 
 <!--![Audio+OBC](../radio/audio_obc/mk1_gt/set_audio_obc.JPG)-->
-_Audio+OBC: Audio+OBC settings..._
+<!--_Audio+OBC: Audio+OBC settings..._-->
 <!--![Audio+OBC](../radio/audio_obc/vm_gt/set_audio_obc.JPG)-->
 <!--_Audio+OBC: Audio+OBC settings..._-->
 

diff --git a/radio/46.md b/radio/46.md
@@ -2,7 +2,7 @@
 
 ### Related
 
-- `0x45` [Radio UI](../gt/45.md)
+- `0x45` [Set Radio UI](../gt/45.md)
 
 ### Examples
 

diff --git a/radio/arbitration.md b/radio/arbitration.md
@@ -16,14 +16,6 @@ _The need for arbitration is a result of heretounforeseen resource contention. T
 
 --
 
-Module|Variant|Note|Command|Argument
-:-----|:------|:---|:------|:-------
-Radio|C23|Hide Overlay|`46`|`0b0000_1110`
-Radio|C23|Menu (Reply?)|`46`|`0b0000_0001`
-Radio|C23|Hide Tone|`46`|`0b0000_1000`
-Radio|C23|Hide Select|`46`|`0b0000_0100`
-Radio|C23|Turn Off|`46`|`0b0000_1110`
-
 Module|Variant|Note|Command|Argument
 :-----|:------|:---|:------|:-------
 GT|MK1|Ignition|`45`|`0b0000_0000`
@@ -32,6 +24,13 @@ GT|MK1|Audio OBC|`45`|`0b0000_0011`
 GT|VM|Ignition|`45`|`0b0000_0000`
 GT|VM|Ignition|`46`|`0b0000_0001`
 
+Module|Variant|Note|Command|Argument
+:-----|:------|:---|:------|:-------
+Radio|C23|Hide Overlay|`46`|`0b0000_1110`
+Radio|C23|Menu (Reply?)|`46`|`0b0000_0001`
+Radio|C23|Hide Tone|`46`|`0b0000_1000`
+Radio|C23|Hide Select|`46`|`0b0000_0100`
+Radio|C23|Turn Off|`46`|`0b0000_1110`
 
 ----
 
@@ -104,17 +103,23 @@ GT|VM|Ignition|`46`|`0b0000_0001`
 
 #### hide overlay
 
-    bmbt  rad	BMBT-RAD* 	0x30 (0011 0000) :bmbt_overlay [Overlay] Press 
+    bmbt  rad	BMBT-RAD* 	0x30 (0011 0000) :bmbt_overlay [Overlay] Press
+
     rad   gt	UI-RAD    	state: 0x0e ((0000 1110) Hide: Menu, Hide Header: [ON])
+
     bmbt  rad	BMBT-RAD* 	0xb0 (1011 0000) :bmbt_overlay [Overlay] Release
 
 #### menu button
-    bmbt  glo_h	BMBT-GLO  	0x34 (0011 0100) :bmbt_menu [Menu] Press 
+
+    bmbt  glo_h	BMBT-GLO  	0x34 (0011 0100) :bmbt_menu [Menu] Press
+
     gt    rad	UI-GT     	config: 0x01 ((0000 0001) Main Menu: [ON])
     rad   gt	UI-RAD    	state: 0x01 ((0000 0001) Hide: --, Main Menu: [ON])
+
     bmbt  glo_h	BMBT-GLO  	0xb4 (1011 0100) :bmbt_menu [Menu] Release
 
 #### radio off
+
     bmbt    rad     BMBT-RAD* 	0x06 (0000 0110) :bmbt_power     	[Power]        	Press 
     rad     bmbt	RAD-LED   	led: 00 ((LED) Off)
     rad	    gt    	UI-RAD    	state: 0x0e ((0000 1110) Hide: Menu, Hide Header: [ON])

diff --git a/radio/audio_obc/vm_gt/audio_obc_enabled.JPG b/radio/audio_obc/vm_gt/audio_obc_enabled.JPG