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Daqarta
Data AcQuisition And Real-Time Analysis
Scope - Spectrum - Spectrogram - Signal Generator
Software for Windows
Science with your Sound Card!

The following is from the Daqarta Help system.
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Synth MIDI Voice

Controls: Edit Menu >> Synth Controls >> Voice
Macro: MIDIvoice

Sound card synthesizers have a semi-standard set of instrument voices, but they are not very similar between different card makers. Since the voices are intended for music, not test signals, there are none specifically for standard waveforms like Sine, Square, or Triangle. You may want to scroll through the whole set of 128 voices (0-127) to see which ones are most useful.

To see the Synth waveforms directly, without having to externally route the Line Out to Line In, you may be able to select the Synth from the Input Line select. If you don't see such a line on your card, look for one called MIDI.

When you are looking for a suitable voice, be aware that besides the basic waveform, many voices may have modulation that could make them unsuitable.

Also, most voices have an initial attack portion that dies away to some sustained waveform that is usually softer. You may not notice the transient attack portion during your search, and in fact it may not matter if you intend to use is as a continuous signal. But if you use the Synth Burst option, this could become an issue.

See also Synthesizer Control Dialog.

Applications:

Frequency response

Distortion measurement

Speech and music

Microphone calibration

Loudspeaker test

Musical instrument tuning

Animal sound

Evoked potentials

Rotating machinery

Vehicle pass-by noise

Product test

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