Data AcQuisition And Real-Time Analysis
Scope - Spectrum - Spectrogram - Signal Generator
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Multi-Channel Volume Controls

Macros: MultiVol#0 - MultiVol#7

Windows XP Only. Vista+ coming next version.

Whenever Multi-Channel Outputs is active, the normal stereo volume controls (either the Volume Slider or the dB Slider dialog) are replaced with the Multi-Channel Volume dialog:

You may use the edit controls or the sliders to control the volume of each channel independently. The edit controls accept values from 0 (maximum volume) to -192 (Off). These values are "volume steps". You don't need to enter the minus sign; it will be supplied automatically if omitted.

If you have run Auto-Calibration on your sound card, the actual dB of attenuation is shown in the window below each edit control. (You cannot enter dB values directly.)

Note that unlike the normal stereo controls, which only range from 0 to -191, here -192 is the same as muting that channel; it is totally off. (-191 may not be truly off for your sound card.) Moving a slider all the way to the bottom will produce the same result.

The names under the channel numbers are the standard names used in Windows documentation, but they may not be correct for your sound card.

Note that Ch0 and Ch1 (Left and Right Front) correspond to the Left and Right Master controls in the Volume Slider dialog. For these two channels only, there are separate Wave controls below the sliders that mirror those in the Volume Slider dialog; their attenuation is automatically added to that of the Ch0 or Ch1 dB readouts. Thus, these two channels have a greater control range than the other six.

The Mute All button mutes all channels without changing any of the settings, making it easy to return to prior volume. It is a mirror of the Master Mute button in the Volume Slider dialog.

Macro Notes:

MultiVol#0=n sets Ch0 to step n. Likewise, MultiVol#1 through MultiVol#7 control the other channels.

MultiVol#V=n controls the channel previously set via Ch=0 through Ch=7.

UV=MultiVol?0 sets variable UV to the current step number of Ch0. Likewise, MultiVol?1 through MultiVol?7 read the step numbers for other channels.

UV=MultiVol?V sets UV to the step number of the channel previously set via Ch=0 through Ch=7.

Note that a step number of -192 when setting or reading a channel is the equivalent to 'Off' shown in the edit control (and in the dB readout below it).

You control the two Wave steps via the same VolWaveL and VolWaveR macros used for the Volume Slider dialog, and you use the MasterMute macro for Mute All.

See also Generator Volume/dB Slider Button, Volume Slider Dialog, Attenuator Calibration, Signal Generator Control Dialog


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