0x37 Radio Tone/Select

Radio 0x68 → GT 0x3b

This command allows the radio to load the appropriate Tone (EQ) and Select (playback options) menus.

The BM23 sucks

The BM23 is the odd one out of the radio modules. It works quite differently than BM24, BM53 and BM54. Differences are:

• Select and Tone UIs must be navigated using the Select/Tone and Prev/Next buttons.
• Select in tuner mode only has a instead of I and II
• It does not write the header fields itself, they are hardcoded into the GT and the radio controls them using the 0x23 command.
• The select menu source parameter is not used, the GT uses the layout from the 0x23 command to determine the source.

Related Commands

• 0x36 Radio EQ
• 0x46 Request Radio UI

Example Frames

The common form uses one data byte. Tone (Set) uses four data bytes. An extended Tone Set form may include an optional eight-character label.

68 04 3B 37 05 65
68 04 3B 37 35 55
68 04 3B 37 14 74
68 04 3B 37 50 30
68 04 3B 37 C0 A0
68 04 3B 37 E0 80

# Singular use case. See "Tone (Set)"
68 07 3B 37 82 19 15 0E E3
68 07 3B 37 82 10 10 00 E1
68 07 3B 37 80 00 00 10 F3

Parameters

Variable length. The first byte is always a bitfield.

Most uses have one data byte. Tone Set uses at least four.

Byte 1
ROW_ACTIVE     = 0b0000_0001  # Not used with BM23
SOURCE         = 0b0000_1100  # Not used with BM23
ROW_INDEX      = 0b0011_0000
FUNCTION       = 0b1100_0000

Following bytes are only used if function is set to FUNCTION_TONE_SET:

Byte 2
VALUE_BASS     = 0b0001_1111

Byte 3
VALUE_TREBLE   = 0b0001_1111

Byte 4
VALUE_FADER    = 0b0001_1111

Byte 5
VALUE_BALANCE  = 0b0001_1111

There is also an extended form that can contain an 8 character string.
Use case currently not known.

Byte 6 & 7
RESERVED       = 0b1111_1111
 
Byte 8
RESERVED       = 0b1111_1110
HAS_STRING     = 0b0000_0001

Byte 9 - 16
CHARACTER      = 0b1111_1110

Row Active 0b0000_0001

The GT displays the selected rows list item as pressed if this bit is set. Not used with the BM23.

Source 0b0000_1100

The GT has to know which values it has to display in the list. Not used with the BM23.

SOURCE_TUNER            = 0b0000_0100
SOURCE_TAPE             = 0b0000_1000
SOURCE_CDC              = 0b0000_1100

The New-Gen GT UI does not have a Tape Select Menu.
It instead listens to the select button.
If the button is pressed, the radio requests the select menu, but the GT tells the radio to close it, and then it simulates the Dolby BMBT button.
What the hack!

Row Index 0b0011_0000

Both Tone and Select menus will have up to four rows.

The New-Gen GT UI flipped the order of the rows, the list is created from bottom to top.
This was done because they changed how the dial reacts to the cursor in lists.
As the radio controls the cursor and to be consistent with other lists in the UI, they just reversed the order.
ROW_A is of course still highlighted by default, so yes, the bottom list item is always selected when opening the menus.

Rows can be omitted if for example only 3 rows are needed.

ROW_A   = 0b0000_0000   # Default (top on OG-UI, bottom on NG-UI)
ROW_B   = 0b0001_0000
ROW_C   = 0b0010_0000
ROW_D   = 0b0011_0000   # (bottom on OG-UI, top on NG-UI)

Function 0b1100_0000

Tells the GT the menu type, tone or select.

FUNCTION_SELECT       = 0b0000_0000
FUNCTION_SELECT_BM23  = 0b0100_0000
FUNCTION_TONE_SET     = 0b1000_0000
FUNCTION_TONE         = 0b1100_0000

FUNCTION_TONE_SET is used for opening the tone menu and filling it with initial data.\n FUNCTION_TONE is then used for updating the cursor position.

FUNCTION_SELECT_BM23 tells the GT to use the 0x23 title command layout to determine the source.

Value 0b0001_1111

Only applicable to FUNCTION_TONE_SET.

See Value in 0x36 Radio EQ

Use Cases

Select (BM53)

Radio

Bitwise	Value	Symbol	Text	State
FUNCTION_SELECT_NG & ROW_D & SOURCE_RADIO & OPTS_HIGHLIGHT	0x34	I	Search non sensitive	Highlight
FUNCTION_SELECT_NG & ROW_D & SOURCE_RADIO & OPTS_ACTIVE	0x35	< I >	Search non sensitive	Activated
FUNCTION_SELECT_NG & ROW_C & SOURCE_RADIO & OPTS_HIGHLIGHT	0x24	II	Search sensitive	Highlight
FUNCTION_SELECT_NG & ROW_C & SOURCE_RADIO & OPTS_ACTIVE	0x25	< II >	Search sensitive	Activated
FUNCTION_SELECT_NG & ROW_B & SOURCE_RADIO & OPTS_HIGHLIGHT	0x14	SCAN	Station sample	Highlight
FUNCTION_SELECT_NG & ROW_B & SOURCE_RADIO & OPTS_ACTIVE	0x15	SCAN	Station sample	Activated
FUNCTION_SELECT_NG & ROW_A & SOURCE_RADIO & OPTS_HIGHLIGHT	0x04	m	Manual station choice	Highlight
FUNCTION_SELECT_NG & ROW_A & SOURCE_RADIO & OPTS_ACTIVE	0x05	< m >	Manual station choice	Activated

CDC

Bitwise	Value	Symbol	Text	State
FUNCTION_SELECT_NG & ROW_D & SOURCE_CDC & OPTS_HIGHLIGHT	0x3c	< >	Music search	Highlight
FUNCTION_SELECT_NG & ROW_D & SOURCE_CDC & OPTS_ACTIVE	0x3d	< >	Music search	Activated
FUNCTION_SELECT_NG & ROW_C & SOURCE_CDC & OPTS_HIGHLIGHT	0x2c	RANDOM	Random generator	Highlight
FUNCTION_SELECT_NG & ROW_C & SOURCE_CDC & OPTS_ACTIVE	0x2d	RANDOM	Random generator	Activated
FUNCTION_SELECT_NG & ROW_B & SOURCE_CDC & OPTS_HIGHLIGHT	0x1c	SCAN	Track sample	Highlight
FUNCTION_SELECT_NG & ROW_B & SOURCE_CDC & OPTS_ACTIVE	0x1d	SCAN	Track sample	Activated
FUNCTION_SELECT_NG & ROW_A & SOURCE_CDC & OPTS_HIGHLIGHT	0x0c	<< >>	Fast forward/reverse	Highlight
FUNCTION_SELECT_NG & ROW_A & SOURCE_CDC & OPTS_ACTIVE	0x0d	<< >>	Fast forward/reverse	Activated

Select (C23)

Source is inherent for the C23, so the examples below just reflect the three possible contexts: radio, CDC, and tape.

Legacy radios do not support cycling through, or selecting options via the navigation dial. Cycling options requires repeated use of the BMBT’s SELECT button. As for “activating” a highlighted option, I’ve not the faintest idea, just mash the BMBT buttons and see how you go.

Note: the below is a C23 BM with MK4 (4-1/00) which is an unlikely pairing, but I couldn’t be bothered busting out an early “MK1” video module.

Radio

Row four/D is omitted as there are only three options.

Bitwise	Value	Symbol	Text
FUNCTION_SELECT & ROW_C	0x60	a	Automatic search
FUNCTION_SELECT & ROW_B	0x50	SCAN	Station sample
FUNCTION_SELECT & ROW_A	0x40	m	Manual station choice

CDC

Bitwise	Value	Symbol	Text
FUNCTION_SELECT & ROW_D	0x70	< >	Music Search
FUNCTION_SELECT & ROW_C	0x60	RANDOM	Random generator
FUNCTION_SELECT & ROW_B	0x50	SCAN	Track sample
FUNCTION_SELECT & ROW_A	0x40	<< >>	Fast forward/reverse

Tape

Rows three (ROW_C) and four (ROW_D) are omitted as there are only two options.

Bitwise	Value	Symbol	Text
FUNCTION_SELECT & ROW_B	0x50	<< >>	Fast forward/reverse
FUNCTION_SELECT & ROW_A	0x40	< >	Music Search

Tone (Set)

This is the single use case that affects the message length.

When the radio requests Tone (EQ) be displayed, it simultaneously sets the value of each property.

# Tone (Set): Neutral values
# FUNCTION_TONE_SET & 0x10 => 0x90
68 07 3B 37 90 10 10 00 F3

# Tone (Set): Minimum values
# FUNCTION_TONE_SET & 0x1c => 0x9c
68 07 3B 37 9C 1C 1F 1F E3

# Tone (Set): Maximum values
# FUNCTION_TONE_SET & 0x0c => 0x8c
68 07 3B 37 8C 0C 0F 0F E3

Tone

Bitwise	Value	Text	State
FUNCTION_TONE & ROW_D	0xf0	Balance	Highlight
FUNCTION_TONE & ROW_C	0xe0	Fader	Highlight
FUNCTION_TONE & ROW_B	0xd0	Treble	Highlight
FUNCTION_TONE & ROW_A	0xc0	Bass	Highlight