minifloat redefined

terranmon.txt

@@ -2137,13 +2137,13 @@ from source.
             (bits 14..15 reserved)
 21  Bit16x25 Volume envelopes
        Byte 1: Volume (00..3F)
-       Byte 2: Time until the next point, in seconds (3.5 Unsigned Minifloat). 0 = hold at this point indefinitely.
+       Byte 2: Time until the next point, in seconds (3.5 Unsigned Minifloat, biased; range 0..15.75 s, smallest non-zero step 1/256 s ≈ 3.91 ms — chosen so single tracker ticks resolve at every supported BPM). 0 = hold at this point indefinitely.
 71  Bit16x25 Panning envelopes
       Byte 1: Pan (00..FF)
-      Byte 2: Time until the next point, in seconds (3.5 Unsigned Minifloat). 0 = hold at this point indefinitely.
+      Byte 2: Time until the next point, in seconds (3.5 Unsigned Minifloat, biased; range 0..15.75 s, smallest non-zero step 1/256 s ≈ 3.91 ms — chosen so single tracker ticks resolve at every supported BPM). 0 = hold at this point indefinitely.
 121 Bit16x25 Pitch/Filter envelopes
       Byte 1: Value (00..FF)
-      Byte 2: Time until the next point, in seconds (3.5 Unsigned Minifloat). 0 = hold at this point indefinitely.
+      Byte 2: Time until the next point, in seconds (3.5 Unsigned Minifloat, biased; range 0..15.75 s, smallest non-zero step 1/256 s ≈ 3.91 ms — chosen so single tracker ticks resolve at every supported BPM). 0 = hold at this point indefinitely.
 171 Uint8  Instrument Global Volume (0..255)
         * ImpulseTracker has range of 0..128; multiply by (255/128) then round to int
             - ImpulseTracker also has samplewise default volume (0..64) and samplewise global volume (0..64), and they must be taken into account because Taud has no samplewise config, following the ImpulseTracker spec
@@ -2464,40 +2464,45 @@ Play Head Flags
 
 65536..131071 RW: PCM Sample buffer
 
-Table of 3.5 Minifloat values (CSV)
+Table of 3.5 Minifloat values (CSV).
+Rebiased 2026-05-07 so the smallest non-zero step is 1/256 s and the maximum
+is 15.75 s — every cell is the original LUT value divided by 8. Chosen for
+tracker envelopes: a single song tick (≈ 8.9 ms at BPM 280, ≈ 41.7 ms at
+BPM 24) now lands within ±17 % of an LUT entry across the whole supported
+BPM range; the previous bias was ±150 % at common BPMs.
      ,000,001,010,011,100,101,110,111,MSB
-00000,0,1,2,4,8,16,32,64
-00001,0.03125,1.03125,2.0625,4.125,8.25,16.5,33,66
-00010,0.0625,1.0625,2.125,4.25,8.5,17,34,68
-00011,0.09375,1.09375,2.1875,4.375,8.75,17.5,35,70
-00100,0.125,1.125,2.25,4.5,9,18,36,72
-00101,0.15625,1.15625,2.3125,4.625,9.25,18.5,37,74
-00110,0.1875,1.1875,2.375,4.75,9.5,19,38,76
-00111,0.21875,1.21875,2.4375,4.875,9.75,19.5,39,78
-01000,0.25,1.25,2.5,5,10,20,40,80
-01001,0.28125,1.28125,2.5625,5.125,10.25,20.5,41,82
-01010,0.3125,1.3125,2.625,5.25,10.5,21,42,84
-01011,0.34375,1.34375,2.6875,5.375,10.75,21.5,43,86
-01100,0.375,1.375,2.75,5.5,11,22,44,88
-01101,0.40625,1.40625,2.8125,5.625,11.25,22.5,45,90
-01110,0.4375,1.4375,2.875,5.75,11.5,23,46,92
-01111,0.46875,1.46875,2.9375,5.875,11.75,23.5,47,94
-10000,0.5,1.5,3,6,12,24,48,96
-10001,0.53125,1.53125,3.0625,6.125,12.25,24.5,49,98
-10010,0.5625,1.5625,3.125,6.25,12.5,25,50,100
-10011,0.59375,1.59375,3.1875,6.375,12.75,25.5,51,102
-10100,0.625,1.625,3.25,6.5,13,26,52,104
-10101,0.65625,1.65625,3.3125,6.625,13.25,26.5,53,106
-10110,0.6875,1.6875,3.375,6.75,13.5,27,54,108
-10111,0.71875,1.71875,3.4375,6.875,13.75,27.5,55,110
-11000,0.75,1.75,3.5,7,14,28,56,112
-11001,0.78125,1.78125,3.5625,7.125,14.25,28.5,57,114
-11010,0.8125,1.8125,3.625,7.25,14.5,29,58,116
-11011,0.84375,1.84375,3.6875,7.375,14.75,29.5,59,118
-11100,0.875,1.875,3.75,7.5,15,30,60,120
-11101,0.90625,1.90625,3.8125,7.625,15.25,30.5,61,122
-11110,0.9375,1.9375,3.875,7.75,15.5,31,62,124
-11111,0.96875,1.96875,3.9375,7.875,15.75,31.5,63,126
+00000,0,0.125,0.25,0.5,1,2,4,8
+00001,0.00390625,0.12890625,0.2578125,0.515625,1.03125,2.0625,4.125,8.25
+00010,0.0078125,0.1328125,0.265625,0.53125,1.0625,2.125,4.25,8.5
+00011,0.01171875,0.13671875,0.2734375,0.546875,1.09375,2.1875,4.375,8.75
+00100,0.015625,0.140625,0.28125,0.5625,1.125,2.25,4.5,9
+00101,0.01953125,0.14453125,0.2890625,0.578125,1.15625,2.3125,4.625,9.25
+00110,0.0234375,0.1484375,0.296875,0.59375,1.1875,2.375,4.75,9.5
+00111,0.02734375,0.15234375,0.3046875,0.609375,1.21875,2.4375,4.875,9.75
+01000,0.03125,0.15625,0.3125,0.625,1.25,2.5,5,10
+01001,0.03515625,0.16015625,0.3203125,0.640625,1.28125,2.5625,5.125,10.25
+01010,0.0390625,0.1640625,0.328125,0.65625,1.3125,2.625,5.25,10.5
+01011,0.04296875,0.16796875,0.3359375,0.671875,1.34375,2.6875,5.375,10.75
+01100,0.046875,0.171875,0.34375,0.6875,1.375,2.75,5.5,11
+01101,0.05078125,0.17578125,0.3515625,0.703125,1.40625,2.8125,5.625,11.25
+01110,0.0546875,0.1796875,0.359375,0.71875,1.4375,2.875,5.75,11.5
+01111,0.05859375,0.18359375,0.3671875,0.734375,1.46875,2.9375,5.875,11.75
+10000,0.0625,0.1875,0.375,0.75,1.5,3,6,12
+10001,0.06640625,0.19140625,0.3828125,0.765625,1.53125,3.0625,6.125,12.25
+10010,0.0703125,0.1953125,0.390625,0.78125,1.5625,3.125,6.25,12.5
+10011,0.07421875,0.19921875,0.3984375,0.796875,1.59375,3.1875,6.375,12.75
+10100,0.078125,0.203125,0.40625,0.8125,1.625,3.25,6.5,13
+10101,0.08203125,0.20703125,0.4140625,0.828125,1.65625,3.3125,6.625,13.25
+10110,0.0859375,0.2109375,0.421875,0.84375,1.6875,3.375,6.75,13.5
+10111,0.08984375,0.21484375,0.4296875,0.859375,1.71875,3.4375,6.875,13.75
+11000,0.09375,0.21875,0.4375,0.875,1.75,3.5,7,14
+11001,0.09765625,0.22265625,0.4453125,0.890625,1.78125,3.5625,7.125,14.25
+11010,0.1015625,0.2265625,0.453125,0.90625,1.8125,3.625,7.25,14.5
+11011,0.10546875,0.23046875,0.4609375,0.921875,1.84375,3.6875,7.375,14.75
+11100,0.109375,0.234375,0.46875,0.9375,1.875,3.75,7.5,15
+11101,0.11328125,0.23828125,0.4765625,0.953125,1.90625,3.8125,7.625,15.25
+11110,0.1171875,0.2421875,0.484375,0.96875,1.9375,3.875,7.75,15.5
+11111,0.12109375,0.24609375,0.4921875,0.984375,1.96875,3.9375,7.875,15.75
 LSB
 
 ## Tracker Note Effects