The horizontal time scale on the graphic seems to be one half of the real time scale.

[GoogleCodeExporter]

What steps will reproduce the problem?
1. Start Xoscillo and select New Analog Arduino
2. Connect a sinusoidal signal generated from a signal generator equipment to 
analog port 0. The sinusoidal signal has dc offset so that the signal is in the 
correct range of the Arduino (0 to 5V in my case).
3. The Period of the signal on the graph(measured using the cursor or the 
horizontal scale on the graph) is one half of the real input signal.

What is the expected output? What do you see instead?
For example when the signal has 10 ms Period, the graph shows a signal with 5 
ms Period. Also in the FFT the frequency of the peak is not correct and the 
cursor values and horizontal scale do not agree. The input signal was measured 
with another oscilloscope for confirmation of the problem.  

What version of the product are you using? On what operating system?
The name of download: XOscillo_20130515v9.rar. 
Installed on Windows 7.

Please provide any additional information below.
Great application for the arduino. I think there is this small problem, once 
corrected it should become even better.

Original issue reported on code.google.com by joaonetm...@gmail.com on 18 Feb 2014 at 5:19