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1996-06-18
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Mixing mode Output Devices
Amiga 8-bit, Amiga 14-bit
These modes use the built-in Amiga audio chip (Paula), and they
work with any Amiga. The 8-bit mode is louder than the 14-bit
mode, but it's also more noisy. The "pseudo" 14-bit mode uses a
combination of two Amiga channels to produce one "14-bit"
channel, which has much better dynamical range.
The mixing frequency may be selected pretty freely. The highest
frequency is dependent on the screen mode. OctaMED calculates
the upper limit using the mode of its own screen. If you switch
screens so that the scan frequency changes, the audio output
may become awful.
The mix buffer size can be anything between 32 - 32767, although
it's rounded to the nearest even value. For smooth MIDI usage and
better overall response, a low value is recommended.
Toccata 16-bit
This mode uses MacroSystems' Toccata audio board for high-quality
16-bit output. The support is implemented with toccata.library
which accompanies each Toccata board. Any version of toccata.library
can be used, but library version V6 or later generally produces
better results, allowing higher mixing frequencies and making the
playing immune to interruptions by other system tasks.
Current Toccata boards have 14 distinct output frequencies which
are available as mixing frequencies.
The size of the mixing buffer is rounded to the nearest 512 samples.
Toccata is usable with MIDI, if you use a high mixing frequency
in combination with as low a buffer size as possible (512 or 1024).
MaestroPro 16-bit
MaestroPro is a digital 16-bit sound board by MacroSystems. As
MacroSystems does not provide a support library for MaestroPro,
it is implemented with maestix.library by Richard Körber. This
freely distributable library is available e.g. on Aminet, and a
copy is also provided with OctaMED.
MaestroPro can internally clock only at 48 kHz, and this is the
only available output frequency.
The size of the mixing buffer is rounded to the nearest 1024 samples.
Usually, however, a very large mixing buffer (about 32000 samples or
so) is required. This makes MaestroPro output unsuitable for MIDI
usage, and real-time editing (due to long response times caused by
the long buffer).
Disk 8-bit, Disk 16-bit
These non-realtime output modes are used for producing a digital
"image" of the song on disk. The "image" is a sample file which
can be used for almost anything. For example, you can produce
drum loops by combining several tracks into one sample. Or you
could simply play the song from the HD with little CPU consumption.
Or you could directly use the digital image for putting a song
onto CD without any unnecessary D/A and A/D conversions. The
Smoothing option is particularly useful for producing high-quality
samples with these modes.
There are various output file formats available. The available
formats depend on the selected bit resolution (8-bit or 16-bit)
and whether the song is in Mono or Stereo mode.
The output frequency can be selected freely. The Actual frequency
is always the same as the requested.
The mixing buffer size can be selected freely, and it does not
affect the resulting sample. However, a longer buffer is faster.
Delfina 16-bit
This mode uses the D/A-converter of the Delfina audio board for
high-quality 16-bit output. It does not use the DSP features
available on the board, simply the output part. Delfina system
software (delfina.library) is used. Parts of the support code
and testing were made by Teemu Suikki (thanks!).
Delfina has six output frequencies (as of library V2).
The mix buffer can be 32 - 4096 samples in size.