Help! Bug (?) in export filter as WAV function?

[germanicus]

I'm trying to use REW to create a filter for use with the Inguz plugin for slimserver. As such, I need to export the filter impulse response to a WAV file. However when I do this, the WAV I get is incorrect: viewed in Audacity I can see that it's zero for the first two samples, then fs (full scale) for the third sample, and then all the rest of the samples are zero until the end of the file. So plotted with interpolation it looks like a little triangle and then a flat plateau.

If I save the filter as text it looks OK, and I can export the impulse response itself with no problem either (it looks normal). So this looks like a bug - unless I'm missing something?

I'm running the most recent version on a MacBook Pro laptop.

Any help would be greatly appreciated!

EDIT - I just noticed something strange. If I export the filter as a WAV and then import it to REW again, it looks just fine. What's going on? Is Audacity somehow not displaying it properly? Could there be some kind of file or data type (signed/unsigned or something) mismatch?

[JohnM]

Things to check would be that the filter set selected for export is the one you have set up as your filter, that you have chosen an appropriate word width (the wider the better if your app supports it) and checked the box to normalise the IR.

[germanicus]

JohnM wrote:

Things to check would be that the filter set selected for export is the one you have set up as your filter, that you have chosen an appropriate word width (the wider the better if your app supports it) and checked the box to normalise the IR.

Thanks for the quick response!

All of those check. Changing the word length doesn't help. But given that I can re-import the filter wav into REW and it looks OK, I'm pretty sure the bug is in Audacity and not in REW.

I just tried using the filters with Inguz, and they sound good - so I think the files are OK.