How to set manual start of the impulse response?

For some room acoustical parameters, it is important that the start of the impulse response is known. In the figure below, the start of the impulse response is not correctly found as shown by the yellow line.

If WinMLS is not able to detect the start of the impulse response, this can be done manually. To do this go to Calculate->Calculation Options..., then click on the  button to display the dialog box shown below

Select the setting shown above. Then use Time Data plot type to set the time window. This procedure is also described in the Measurement Walk-Through section.