Multimedia Board (250-1090)          Sound Mixer        Faxback Doc. # 2445

The Tandy Multimedia Mixer enables you to control individual volume levels
for several audio devices at one time. It also lets you test input levels 
of analog-to-digital conversion (ADC) sound and change sound frequency. To 
run the mixer from Windows, follow these steps:

1. From the Main Group window, located within the Program Manager window,
   use the mouse to double-click on the Control Panel.

2. Double-click on the Sound Mixer icon. The Tandy Multimedia Mixer is
   displayed:

3. Use the up and down arrow keys to move the scroll bars.

   Use the mouse or the tab keys to move from one option to another.

┌──────────────────────┐
│Adjusting the Volume: │
└──────────────────────┘
The mixer enables you to control the volume of six different sound sources,
using the following controls:

° MAS---The master volume control
° FM----MIDI music
° CD----CD player
° MIC---Microphone (default is 0)
° LIN---Line-In
° VOC---Voice or Waveform

Click on the Save button to store the volume settings in the SYSTEM.INI
file.

Click on the Start Test button to start the input source test.

┌─────────────┐
│ADC In Test: │
└─────────────┘
From the ADC In Test box, you can view a graphic representation of sound
level from one of three sources. To test the sound level:

1. Select a source (CD, Mic, or Line-In) by clicking on the corresponding 
   button.

2. Select a filter by clicking on the Low Freq or High Freq button.

3. Press the Start Test button.

When you hear a sound, a "sound" bar appears in the box beside the source
box. The changes in sound level are visible from the changes in the "sound"
bar.

┌─────────┐
│Filters: │
└─────────┘
The high and low filters change the frequency of the sound to the high or
low setting. Use whichever setting you prefer.

┌────────────────────────────┐
│MS-Dos Mixer Control Panel: │
└────────────────────────────┘
When running programs outside the Windows environment, use the MS-DOS mixer
control program to set the volume levels for your MPC. You can set the left
and right channel volume levels for the following outputs:

° Waveform (voice)
° Line Level (stereo equipment)
° FM (MIDI)
° CD audio
° MIC (microphone, right channel only)

Note: You can mix sources and control overall volume with the Mixer Control
      Panel. Jumper J12 is normally set to the output jack for audio
      equipment. For additional control over the volume, the master volume
      control dial, is located on the back of the audio adapter. If you 
      have stereo equipment connected to your MPC system and line out is
      selected, the master volume control dial does not function. This
      volume control feature works the same way in MS-DOS and Windows.

Faxback Document # 2434 will provide specific information on changing
jumper settings.

The SNDMIXER.EXE program is in the Windows directory.

To run the mixer control program from the Windows directory, type
sndmixer and press <ENTER>.

The mixer control panel displays its current settings and the keyboard keys
you can use to change them. When using the mixer control panel, keep the
following information in mind:

° The RESET selection restores the microphone volume to minimum and the
  volume for other components to mid-range.

° The QUIT selection exits the program, asks whether you want to save the
  changes, and prompts you for a filename.

° The F2 key displays an Options Menu.

° Load TSR lets you load the mixer control panel as a terminate-and-stay- 
  resident (TSR) program. Once the program is resident, adjust the master 
  volume level using the up and down arrow keys.

° Unload TSR lets you remove a TSR program from memory. A few applications
  will not operate properly while a TSR program is loaded.

° Select Hotkey lets you specify the hotkey that activates and deactivates
  the mixer control panel TSR.

° Set Port Address lets you select another audio adapter port address if
  your system requires one. If you change the address, you might need to
  change a jumper on the audio adapter. If you change the port address to
  one other than 220, refer to Faxback Document # 2434 for hardware
  configuration settings.

° Quit Options Menu returns to the mixer control panel.

┌────────────┐
│MIDI Setup: │
└────────────┘
MPC programs rely on both basic and extended MIDI applications. You can
configure the MIDI driver as a basic MIDI (to support Channels 13-16), an
extended MIDI (to support Channels 1-10), or a general MIDI (to support
channels 1-16). the default setting, extended MIDI, should give the best
sound. If you are using other programs and are not hearing any sound, you
might need to change to basic MIDI. General MIDI mode is for advanced users
of programs such as MIDI sequencers and is not recommended for normal use.
Use the FM driver setup to change the MIDI driver.

┌─────────────────┐
│FM Driver Setup: │
└─────────────────┘
Most programs recognize the base-level synthesizer and the extended
synthesizer in the FM Driver Setup within the Windows Control Panel.
However, some programs recognize only one level. To enable the audio for a
program that does not recognize the extended synthesizer, follow these
steps:

1. Open the control panel from the main window.

2. Double-click on the Drivers icon to open the list of audio choices.

3. Click on MIDI1.

4. Press the Setup button.

5. Click once on Base-Level Synthesizer in the FM Driver Setup.

6. From the Driver Setup, press the OK button.

7. From the Control Panel, press the OK button.

8. Go back into your CD-ROM session by clicking on the Main Menu icon from
   the Demo window, and restart the application.

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