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19 lines
1.2 KiB
Markdown
19 lines
1.2 KiB
Markdown
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# Capcom QSound (DL-1425)
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This chip was used in Capcom's CP System Dash, CP System II and ZN arcade PCBs.
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It supports 16 PCM channels and uses the patented (now expired) QSound stereo expansion algorithm, as the name implies.
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Because the chip lacks sample interpolation, it's recommended that you try to play samples at around 24038 Hz to avoid aliasing. This is especially important for e.g. cymbals.
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The QSound chip also has a small echo buffer, somewhat similar to the SNES, although with a very basic (and non-adjustable) filter. It is however possible to adjust the feedback and length of the echo buffer. The initial values can be set in the "Configure system" dialog.
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There are also 3 ADPCM channels, however they cannot be used in Furnace yet. They have been reserved in case this feature is added later. ADPCM samples are limited to 8012 Hz.
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# effects
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- `08xx`: Set panning. Valid range is 00-20. 00 for full left, 10 for center and 20 for full right. It is also possible to bypass the QSound algorithm by using the range 30-50.
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- `10xx`: Set echo feedback level. This effect will apply to all channels.
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- `11xx`: Set echo level.
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- `3xxx`: Set the length of the echo delay buffer.
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