Play the dry sweep file (Low to High) through the room/gear that you wish to get an impulse from. Record this ambisonically (FUMA).
Set GratisVolver to "Wet sweep deconvolve".
Put the Inv dry sweep file into GratisVolver as the "Inverted dry sweep WAV-file".
Load your recorded sweep into the "1,2 or 4-channel wet sweep WAV-file" dialog. Select to set your output file.
Now you should get the desired impulse (I hope).
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