20 lines
1.0 KiB
Markdown
20 lines
1.0 KiB
Markdown
# 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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- `10xx`: set echo feedback level.
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- this effect will apply to all channels.
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- `11xx`: set echo level.
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- `12xx`: toggle QSound algorithm (on by default).
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- `3xxx`: set the length of the echo delay buffer.
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