Radio 0x68 → GT 0x3b
BMBT only.
The radio uses this command to update the Tone (EQ) display as the properties are adjusted.
0x37Radio Tone/Select0x46Radio UI
68 04 3B 36 40 21
68 04 3B 36 44 25
68 04 3B 36 54 35
68 04 3B 36 55 34
68 04 3B 36 6A 0B
68 04 3B 36 72 13
68 04 3B 36 78 19
68 04 3B 36 85 E4
68 04 3B 36 98 F9
68 04 3B 36 C2 A3
Fixed length. One byte bitfield.
PROPERTY = 0b1110_0000
VALUE = 0b0001_1111
PROPERTY_BALANCE = 0b0100_0000 # 0x40
PROPERTY_BASS = 0b0110_0000 # 0x60
PROPERTY_FADER = 0b1000_0000 # 0x80
PROPERTY_TREBLE = 0b1100_0000 # 0xc0
The property value is encoded with signed magnitude representation.
# 5-bit signed magnitude encoding
SIGN = 0b0001_0000 # Sign
MAGNITUDE = 0b0000_1111 # Magnitude (absolute value)
Each property has a fixed number of intervals. Treble and Bass have 13 intervals (±6), while Fader and Balance have 21 intervals (±10).
A magnitude of zero 0b0000 represents "neutral" (as denoted by the visual indicator), with sign representing the change relative to neutral.
SIGN_POSITIVE = 0b0_0000 # "Max", "Front", "Left"
SIGN_NEGATIVE = 0b1_0000 # "Min", "Rear", "Right"
The step number will not necessarily equal the encoded number. i.e. the sixth step is not encoded as 0b0110 # 0x6. The respective encoded intervals are summarised below:
| Property | Step (encoded) [neutral to upper limit] |
|---|---|
| Bass / Treble | 0 2 4 6 8 a c |
| Fader / Balance | 0 1 2 3 4 5 8 a c e f |
Just to really fuck with you; while adjusting Fader, Treble, or Bass to the left (visually) is "negative", Balance is "positive".
Up is down, and down is up. (Did you know that Willy Wonka & the Chocolate Factory was filmed in Munich? Seems apt...)
As a respite from German humour, here is a table of the encoded intervals, laid out as they appear visually.
▼ |
|||||
|---|---|---|---|---|---|
| Balance | Left | 0f 0e 0c 0a 08 05 04 03 02 01 |
00 |
11 12 13 14 15 18 1a 1c 1e 1f |
Right |
| Fader | Rear | 1f 1e 1c 1a 18 15 14 13 12 11 |
10 |
01 02 03 04 05 08 0a 0c 0e 0f |
Front |
| Treble | min | 1c 1a 18 16 14 12 |
10 |
02 04 06 08 0a 0c |
max |
| Bass | min | 1c 1a 18 16 14 12 |
10 |
02 04 06 08 0a 0c |
max |
For an additional layer of mind fuckery, the encoding is not consistent with DSP. A number of steps have a different binary value, including neutral (zero), which may switch between negative and positive.
I mean, of course it would.
# BALANCE
68 04 3B 36 4F 2E # +10 LEFT
68 04 3B 36 4E 2F # +9
68 04 3B 36 4C 2D # +8
68 04 3B 36 4A 2B # +7
68 04 3B 36 48 29 # +6
68 04 3B 36 45 24 # +5
68 04 3B 36 44 25 # +4
68 04 3B 36 43 22 # +3
68 04 3B 36 42 23 # +2
68 04 3B 36 41 20 # +1
68 04 3B 36 40 21 # +0
68 04 3B 36 51 30 # -1
68 04 3B 36 52 33 # -2
68 04 3B 36 53 32 # -3
68 04 3B 36 54 35 # -4
68 04 3B 36 55 34 # -5
68 04 3B 36 58 39 # -6
68 04 3B 36 5A 3B # -7
68 04 3B 36 5C 3D # -8
68 04 3B 36 5E 3F # -9
68 04 3B 36 5F 3E # -10 RIGHT
# FADER
68 04 3B 36 9F FE # -10 REAR
68 04 3B 36 9E FF # -9
68 04 3B 36 9C FD # -8
68 04 3B 36 9A FB # -7
68 04 3B 36 98 F9 # -6
68 04 3B 36 95 F4 # -5
68 04 3B 36 94 F5 # -4
68 04 3B 36 93 F2 # -3
68 04 3B 36 92 F3 # -2
68 04 3B 36 91 F0 # -1
68 04 3B 36 90 F1 # +0
68 04 3B 36 81 E0 # +1
68 04 3B 36 82 E3 # +2
68 04 3B 36 83 E2 # +3
68 04 3B 36 84 E5 # +4
68 04 3B 36 85 E4 # +5
68 04 3B 36 88 E9 # +6
68 04 3B 36 8A EB # +7
68 04 3B 36 8C ED # +8
68 04 3B 36 8E EF # +9
68 04 3B 36 8F EE # +10 FRONT
# TREBLE
68 04 3B 36 DC BD # -6 MIN
68 04 3B 36 DA BB # -5
68 04 3B 36 D8 B9 # -4
68 04 3B 36 D6 B7 # -3
68 04 3B 36 D4 B5 # -2
68 04 3B 36 D2 B3 # -1
68 04 3B 36 D0 B1 # -0
68 04 3B 36 C2 A3 # +1
68 04 3B 36 C4 A5 # +2
68 04 3B 36 C6 A7 # +3
68 04 3B 36 C8 A9 # +4
68 04 3B 36 CA AB # +5
68 04 3B 36 CC AD # +6 MAX
# Bass: Min to Max
68 04 3B 36 7C 1D # -6 MIN
68 04 3B 36 7A 1B # -5
68 04 3B 36 78 19 # -4
68 04 3B 36 76 17 # -3
68 04 3B 36 74 15 # -2
68 04 3B 36 72 13 # -1
68 04 3B 36 70 11 # -0
68 04 3B 36 62 03 # +1
68 04 3B 36 64 05 # +2
68 04 3B 36 66 07 # +3
68 04 3B 36 68 09 # +4
68 04 3B 36 6A 0B # +5
68 04 3B 36 6C 0D # +6 MAX