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81ab2acb2c
Trying for more consistency and clarity, especially for quick reference.
1.8 KiB
1.8 KiB
tildearrow Sound Unit
a fantasy sound chip, used in the specs2 fantasy computer designed by tildearrow.
it has the following capabilities:
- 8 channels of either waveform or sample
- stereo sound
- 8 waveforms (pulse, saw, sine, triangle, noise, periodic noise, XOR sine and XOR triangle)
- 128 widths for the pulse wave
- per-channel resonant filter
- ring modulation
- volume, frequency and cutoff sweep units (per-channel)
- phase reset timer (per-channel)
effects
10xx
: set waveform.0
: pulse wave1
: sawtooth2
: sine wave3
: triangle wave4
: noise5
: periodic noise6
: XOR sine7
: XOR triangle
12xx
: set pulse width. range is0
to7F
.13xx
: set resonance of filter. range is0
toFF
.- despite what the internal effects list says (
0
toF
), you can use a resonance value from0
toFF
(255).
- despite what the internal effects list says (
14xx
: set filter mode and ringmod.- bit 0: ring mod
- bit 1: low pass
- bit 2: high pass
- bit 3: band pass
15xx
: set frequency sweep period low byte.16xx
: set frequency sweep period high byte.17xx
: set volume sweep period low byte.18xx
: set volume sweep period high byte.19xx
: set cutoff sweep period low byte.1Axx
: set cutoff sweep period high byte.1Bxx
: set frequency sweep boundary.1Cxx
: set volume sweep boundary.1Dxx
: set cutoff sweep boundary.1Exx
: set phase reset period low byte.1Fxx
: set phase reset period high byte.20xx
: toggle frequency sweep.- bit 0-6: speed
- bit 7: up direction
21xx
: toggle volume sweep.- bit 0-4: speed
- bit 5: up direction
- bit 6: loop
- bit 7: alternate
22xx
: toggle cutoff sweep.- bit 0-6: speed
- bit 7: up direction
4xxx
: set cutoff. range is0
toFFF
.