Quote:
JohnM wrote:
 Is REW set to control output and input volume on the SC settings? If so, does it make any difference if you uncheck the boxes to control the volume? Does sound like there is some kind of feedback loop though, may be worth posting pics of your sc mixer settings. |
REW is never set to control the output volume and the master volume in Windows is set to 0 (not used for SPDIF).
I have attached to pictures to show you the different windows.
I tried to play a bit with the input volume in the settings and this is what I found:
1) If the RadioShack is turned off or the analog cable connected to LINE_IN unplugged then I don't hear any feedback into the speakers. If I modify the RadioShack scale from 80dB to 90dB then the feedback sound gets very weak but I still don't get any sound out. Scale over 90dB don't help much more
2) Having the input volume box checked or not does not make much difference. The feedback noise first gets lower then increase again progressively.
I only tried with my sub now but it sounds like the feedback sound is both louder and at a higher frequency than my 50Hz sinus test tone.
The two pictures below show how REW was configured when I tried with and without input volume control. As I wrote before, I reproduce the problem by pushing the record button in the SPL Meter window.