Creative CT4180 Getting Started Guide - Page 87

Notes for WaveSynth/WG Users, Full-Duplex Mode

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Notes for WaveSynth/WG Users For the past few years, hardware wavetable synthesis has been the high-end alternative to FM synthesis for audio reproduction in personal computers. With ever-increasing CPU power and Intel's new multimedia-extended instructions, software wavetable synthesis is now feasible and can be powerful. This is why we have introduced our software wavetable synthesizer, Creative WaveSynth/WG. Since the technology is relatively new, it currently has some limitations. Due to these limitations, it is necessary to have two modes of operations for Creative's sound system - full-duplex and half-duplex modes. Each mode caters to different needs but has some constraints (which are explained in this leaflet). Thus, you should select the mode that suits your needs. The following constraints apply in both full-duplex and half-duplex modes: u You cannot record a WaveSynth/WG MIDI playback because currently, the Sound Blaster hardware and driver do not support this. u While WaveSynth/WG is playing a MIDI file, you cannot enable Creative Mixer's LED display. And vice versa. Some of the constraints explained in this leaflet may not apply to your audio card. For details, refer to the Readme file in you audio package. Full-Duplex Mode When you select this mode, you can play and record audio data concurrently. But there are some constraints in this mode: u If you want to play back and record concurrently, you can only do so using uncompressed wave files, that is, Pulse Code Modulation (PCM) data. u While WaveSynth/WG is playing a MIDI file, you cannot do a wave (including DirectSound) playback at the same time. u You cannot add reverb to a wave (including DirectSound) playback. u Since WaveSynth/WG outputs sounds at 22 kHz, if you are recording a wave file at any other sampling rate, WaveSynth/WG cannot play a MIDI file because the sampling rates for both playback and recording must be the same. 1

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1
For the past few years, hardware wavetable synthesis has been the high-end
alternative to FM synthesis for audio reproduction in personal computers.
With ever-increasing CPU power and Intel’s new multimedia-extended
instructions, software wavetable synthesis is now feasible and can be
powerful.
This is why we have introduced our software wavetable
synthesizer, Creative WaveSynth/WG.
Since the technology is relatively
new, it currently has some limitations.
Due to these limitations, it is necessary to have two modes of operations for
Creative’s sound system — full-duplex and half-duplex modes.
Each mode
caters to different needs but has some constraints (which are explained in this
leaflet).
Thus, you should select the mode that suits your needs.
The following constraints apply in both full-duplex and half-duplex modes:
You cannot record a WaveSynth/WG MIDI playback because
currently, the Sound Blaster hardware and driver do not support this.
While WaveSynth/WG is playing a MIDI file, you cannot enable
Creative Mixer’s LED display.
And vice versa.
Some of the constraints explained in this leaflet may not apply to your
audio card.
For details, refer to the Readme file in you audio package.
Full-Duplex Mode
When you select this mode, you can play and record audio data concurrently.
But there are some constraints in this mode:
If you want to play back and record concurrently, you can only do so
using uncompressed wave files, that is, Pulse Code Modulation
(PCM) data.
While WaveSynth/WG is playing a MIDI file, you cannot do a wave
(including DirectSound) playback at the same time.
You cannot add reverb to a wave (including DirectSound) playback.
Since WaveSynth/WG outputs sounds at 22 kHz, if you are recording
a wave file at any other sampling rate, WaveSynth/WG cannot play a
MIDI file because the sampling rates for both playback and recording
must be the same.
Notes for WaveSynth/WG Users