The Command Works Mixer - How Does it Work?
High Speed Voice & Music Mixing - No Mixing Board Required
Go to BIT WORKS home page
What is the Command Works MixerTM?
The Command Works MixerTM is the program shipped with the Audio
Works StationTM that allows automatic multiple mixes and simple mixes to be made from the command line (type three file
names and you are done).
Why Was the Command Works MixerTM Developed?
Mixing voice and music together has traditionally been a labour
intensive task. Often the types of programs created are similar from
mix to mix and only the content changes. Such is the case for
"message on hold" and many audiotex productions. A few years ago,
some of our customers who were using the Audio Works StationTM for
high volume audiotex message recording asked us if there was a way
that their "message on hold" tape production could be similarly
automated. After learning the steps currently being used to produce
messages, and where the duplicated labour was being spent, we
developed the Command Works MixerTM.
How does the Command Works MixerTM Operate?
The Command Works MixerTM mixing voice and music after reading a
recipe which contains instructions detailing as:
the level of the background music when the voice is playing
the length of the production
the voice files to be used?
where pre-rolls and post rolls are required
The operation of the Command Works MixerTM is analogous to a
software compiler but there are far fewer instructions and the
syntax is straight forward.
Do I have to be a Programmer to Operate the Command Works MixerTM?
No. A working knowledge of DOS batch command is useful but not
essential. Very elaborate mixing (using up to 99 voice segments and
99 background music segments) may be created, but the majority of
productions are very simple.
What if I Don't Want to Write a Recipe for Mixing Audio Because I
Have More Important Things to Do?
Most routine mixes may be reduce to a few line in a DOS batch
command. The batch command can take file name from the command line
and actually write the mixing recipe for you.
For example, the following batch command shipped with the Audio
Works StationTM take two file names from the command line and mixes
them into a single output file without changing the originals.
rem DOS batch file quickmix.bat
rem batchmix voice.pcm backgrnd.pcm output.pcm
rem write the recipe
echo seg:%1 ambient:6 mixed:6 >mixtmp
echo back:%2 ambient:6 mixed:0 prefade: postfade: >>mixtmp
echo mode:segment ramptime:10 rate:8000 >>mixtmp
echo out:%3 >>mixtmp
rem mix the recipe
call batchmix mixtmp
To run this batch command, from the DOS prompt, jut type -
quickmix voicefile musicfile outputfile [Enter]
How Are the Voice and Music Files Acquired?
The voice and music files may be captured with the Audio Works
StationTM as flat pieces of audio (no fades etc.) or they may be
converted from existing digitized files using the utilities
supplied with the Audio Works StationTM.
How Are the Audio Levels Controlled?
The Command Works MixerTM determines the relative levels of the
voice and background music files being mixed. The audio may be set
to reference level prior to mixing with a simple command or this
may be included as part of and automatic batch command.
The Command Works MixerTM has the ability to independently control
the level of the back ground music 1) during and after every voice
segment, 2) during the initial background roll if included and the
final post-roll, 3) as it fades into, and out of, every voice
How Long Does It Take For The Mixing Process?
Typically the mixes will occur at least 4-5 times faster than real
time on a moderate 486 and up to 20 times faster than real time on
a Pentium. Far more time is actually spent reading the audio into
What Are Some of the Other Benefits of the Command Works MixerTM?
10's or 100's of mixes may be performed with a single command
the original recordings are left in tact
the mixed file may be played to tape or compressed to telco formats
levels on many mixes may be changed quickly with a text editor
mixing may be performed much faster than real-time
What Types of Applications have Benefited From Automatic Mixing?
music preview systems
"message on-hold tape product"
"pay per call" message systems
talent preview lines
customized greeting card production systems
movie preview systems
system greetings with background music
BIT WORKS home page