Creative CT4180 Getting Started Guide - Page 88
Half-Duplex Mode
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For some audio cards, WaveSynth/WG can output sounds at 44 kHz if you select this option in the WaveSynth/WG control panel. In addition, for Sound Blaster cards that use one 8-bit and one 16-bit DMA channels for either playback or recording, the following constraints also apply: u while you are recording a 16-bit wave file, WaveSynth/WG cannot play a MIDI file; u while WaveSynth/WG is playing a MIDI file, you can record only an 8-bit wave file; since WaveSynth/WG must play back through the 16-bit DMA channel. If audio playback or recording is too slow (for example, resulting in clicking sounds heard during playback), try to reduce the sampling rate to improve performance. Half-Duplex Mode When you select this mode, you can do a wave (including DirectSound) playback while WaveSynth/WG is playing a MIDI file. But there are some constraints in this mode: u You cannot play an audio file and record another one at the same time. u Creative FastSpeech playback is not supported. u Wave playback is restricted to the sampling rate conversions that Microsoft's Audio Compression Manager (ACM) supports. ACM will do the necessary sampling rate conversion during playback. Thus, if you do not have ACM, you cannot play 8 kHz wave files. u You cannot play wave files when Creative Mixer's LED is active because LED is doing recording. (To disable LED, refer to Creative Mixer's online help.) u The Volume Unit display of Microsoft Mixer is not available. No part of this publication may be reproduced or transmitted in any form or by any means without the prior written consent of Creative Technology Ltd. Copyright © 1997 Creative Technology Ltd. All rights reserved. Sound Blaster is a trademark of Creative Technology Ltd. Microsoft, MS-DOS, Windows 3.x, and Windows 95 are trademarks of Microsoft Corporation. All other products are trademarks or registered trademarks of their respective owners.