
Digital audio files are the most useful source for sound, as playback is virtually instant and they can
all be stored on hard drive for easy access.
ShowMagic supports 2 different types of audio drivers - DirectShow drivers and ASIO drivers.
Either or both of these drivers may be available for one or more of the audio outputs on the
soundcard depending on the audio hardware you are using. For instance, with an M-Audio Delta
1010 multiple input / output soundcard there are DirectShow drivers available for analogue outputs
1 to 8 and ASIO drivers available for analogue outputs 1 to 8. Both these drivers ‘share’ the same
physical outputs on the card. Where there are DirectShow drivers available for the physical audio
outputs, we refer to these herein as ‘DirectShow channels’. Similarly, where there are ASIO drivers
available for the physical audio outputs, we refer to these herein as ‘ASIO channels’.
Microsoft ‘DirectShow’ Drivers
Audio files in uncompressed ‘.wav’ file format, and audio files in ‘.mp3’, ‘.wma’ or ‘.aif’
compressed formats can all be played by ShowMagic using any available outputs with DirectShow
drivers. On the ‘Default’ Directshow channels (as selected on the Windows ‘Sound and Audio
Devices’ dialogue box) multiple files (of multiple types) can be played at the same time.
Please Note:
On any other DirectShow channels (other than the default) only one audio file can be played at any
one time. If an audio file is started - that uses the same channels as another audio file that is already
playing on those channels - the previous audio file is stopped.
ASIO Drivers
ASIO drivers only support playback of un-compressed .wav files, but the advantage of using ASIO
outputs is that multiple uncompressed wave (.wav) files can be played to any of the multiple audio
outputs (with up to 16 channels synchronized) and on SLX and AV models audio inputs can also be
mixed / routed to any of the multiple outputs.
As described later in this manual, any available
DirectShow or ASIO channels that ShowMagic finds available are listed in a pop-up menu, and can
be selected for routing your audio files.
Please Note:
Not all soundcards that have more than 2 audio outputs allow you to adjust the volume levels on the
DirectShow channels using the ShowMagic volume faders. This is dependent on the soundcard and
its drivers. PC MIDI files can be useful for some applications as these files are very much smaller
than wave files. 5.1 and 7.1 surround-sound files can also be played using a suitable 5.1 / 7.1
soundcard / interface.
On a standard Soundblaster compatible PC soundcard, Digital, line-level, microphone-level inputs
and MIDI files are all played through the same default DirectShow stereo outputs on the card; the
volume mixing of each of these can however be set independently via the ShowMagic desk.
Full control of volume fade-in and fade-out and stereo balance for each sound event, each of the
audio channels or the master volume for all audio channels, is also available via the desk. The start
and stop playback positions of digital audio and MIDI files are also selectable. For instance you
can start playing a wave file from any point (to the nearest 25
th
of a second) into the sound file.
Control Events
8
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