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update sample doc

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tildearrow 2022-08-13 02:48:34 -05:00
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papers/doc/6-sample/README.md
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@ -4,29 +4,54 @@ In the context of Furnace, a sound sample (usually just referred to as a sample)
In Furnace, these samples can be generated by importing a .wav (think of it as an higher quality MP3) file.
## supported systems
## supported chips
as of Furnace 0.6, the following sound chips have sample support:
As of Furnace 0.6, the following sound chips have sample support:
- NES/Ricoh 2A03 (with DPCM support and only on channel 5)
- Sega Genesis/YM2612 (channel 6 only; but only if there exists a `1701` effect that gets played on or before a trigger for a sample, or if you are using an instrument with Sample type)
- PC Engine/TurboGrafx 16/Huc6280 (same conditions as above)
- Amiga/Paula (on all channels)
- Arcade/SEGA PCM (same as above)
- Neo Geo/Neo Geo CD (on the last 7 channels (6 if you are using Neo Geo CD) only and can be resampled the same way as above)
- Seta/Allumer X1-010 (same as YM2612)
- Sega Genesis/YM2612 (channel 6 only)
- PC Engine/TurboGrafx-16/HuC6280
- Amiga/Paula
- SegaPCM
- Neo Geo/Neo Geo CD/YM2610 (ADPCM channels only)
- Seta/Allumer X1-010
- Atari Lynx
- MSM6258 and MSM6295
- YMU759/MA-2 (last channel only)
- QSound
- ZX Spectrum 48k
- ZX Spectrum 48k (1-bit)
- RF5C68
- WonderSwan
- Tildearrow Sound Unit
- tildearrow Sound Unit
- VERA (last channel only)
- Y8590 (last channel only)
- And a few more that I've forgotten to mention.
- Y8950 (last channel only)
- a few more that I've forgotten to mention
Furnace also has a feature where you can make an Amiga formarted instrument on the YM2612 and Huc6280 to resample a sample you have in the module.
## compatible sample mode
effect `17xx` enables/disables compatible sample mode whether supported (e.g. on Sega Genesis or PC Engine).
in this mode, samples are mapped to notes in an octave from C to B, allowing you to use up to 12 samples.
if you need to use more samples, you may change the sample bank using effect `EBxx`.
use of this mode is discouraged in favor of Sample type instruments.
## notes
due to limitations in some of those sound chips, some restrictions exist:
- Amiga: sample lengths and loop will be set to an even number, and your sample can't be longer than 131070.
- NES: if on DPCM mode, only a limited selection of frequencies is available, and loop position isn't supported (only entire sample).
- SegaPCM: your sample can't be longer than 65535, and the maximum frequency is 31.25KHz.
- QSound: your sample can't be longer than 65535, and the loop length shall not be greater than 32767.
- Neo Geo (ADPCM-A): no looping supported. your samples will play at ~18.5KHz.
- Neo Geo (ADPCM-B): no loop position supported (only entire sample), and the maximum frequency is ~55KHz.
- YM2608: the maximum frequency is ~55KHz.
- MSM6258/MSM6295: no arbitrary frequency.
- ZX Spectrum Beeper: your sample can't be longer than 2048.
- Seta/Allumer X1-010: frequency resolution is terrible in the lower end. your sample can't be longer than 131072.
furthermore, many of these chips have a limited amount of sample memory. check memory usage in window > statistics.
# the sample editor
@ -34,11 +59,12 @@ You can actually tweak your samples in Furnace's sample editor, which can be acc
In there, you can modify certain data pertaining to your sample, such as the:
- volume of the sample in percentage, where 100% is the current level of the sample (note that you can distort it if you put it too high)
- the sample rate, from 0Hz (no sample movement) to 65535Hz (65.5kHz).
- the sample rate.
- what frequencies to filter, along with filter level/sweep and resonance options (much like the C64)
- and many more.
The changes you make will be applied as soon as you've committed them to your sample, but they can be undoed and redoed, just like text.
# tips
If you have a sample you wanna use that is about 44100 or anything over 32000Hz, downsample the sample to 32000Hz so that the pitch of the sample in Furnace stays like the original audio file. You can do this in Audacity by going to the bottom left of the screen (If you see "Project Rate (Hz)" you are there), change the project rate to 32000Hz and save the file to wav in Audacity using "File -> Export -> Export as WAV".
if you have a sample you wanna use that is about 44100 or anything over 32000Hz, downsample the sample to 32000Hz so that the pitch of the sample in Furnace stays like the original audio file,