dual scope doesn't work

[orlandini1]

Hello,

I'm an electronics french teacher an I just begin with Flowstone. It seems to me a fantastic program but i have a problem with the example program named "dual scope". When i oppen it, nothing appears on the scope. Can someone help me?

Thank you and excuse my poor english.

[Embedded]

Hello and Welcome!

I just tested to Dual scope download from the Examples and it works fine on my machine?

It uses the Direct Sound out so that you can hear the waveforms, and therefore you must have a sound card installed.

Maybe your sound card is not selected. Try clicking on the 'Primary Sound Driver' button on the 'DS Out' module.

Once your sound card is selected you should be able to hear the audio and also see the waveforms on the dual scope.

[orlandini1]

Thank you for your test.
I've tried again and it still doesn't work. When i open the example a box appears which says:
Direct sound could not be started.
The most likely reason for this is that you have an application running that is using ASIO.
To solve the problem, close the application that using ASIO or change it so that it uses Direct Sound instead.

I don't really understand. I've verified that no application is running. Is it because i use the free Flowstone.
Why is it necessary to use sound card with dual scope. Is it possible to use an other module to see sine without sound card?

Thank you

[DSP]

FlowStone FREE works fine for this, but you do need a working sound card for this particular example as it is generating real-time sound and it needs a device to get the sample rate from!

If you just want to display a waveform like a graph there is a different example which uses an array:

http://www.dsprobotics.com/support/viewtopic.php?f=11&t=26