i am interested in the Voxengo Deconvolver but i have some questions before purchasing:
I ran the Trial but my test-results were not pleasing yet. Maybe i am doing something wrong. Well, i am just a musician with limited technical knowledge so I would be glad for some tipps:
My aim is to create specific IRs (EQ-Curve and Cab) to import into a Fractal Audio Axe-FX Hardware Unit. The deconvoluted files have to be mono, 48Khz, 24 Bit, 1024 Samples.
As an easy starting point i wanted to create IRs of 3 different VST Plugins within my DAW (48Khz and 24 bit)
(a: EQ, b: Reverb, c: Cab-Simulation):
1) created a 6s long Sweep with fades using the Voxengo Deconvolver
2) imported the file into the DAW and added a VST Plugin
3) reduced the Audio-level of the sweep to receive a nearly -0.3 db wet output Level (after VST FX)
4) set the Left marker at the beginning of the Sweep-file and right marker at the end of the sweep +1 sec
5) exported the 100%-wet Signal (length 7 seconds) mono, 24bit, 48Khz
6) deconvoluted with the Voxengo using REVERSED Technique
7) duplicated the original Sweep within my DAW to a second Track and added the SIR2 (even tried Waves IR1)
8) imported the dc-File into SIR2 and compared the output signal of both tracks
=> I thought both tracks should now be nearly identical (Track 1: Sweep + VST; Track 2: Sweep + SIR2 with imported dc-IR)
9) compared the signals acoustically and with some Audioanalyzer and there a big differences in the signals
a) the dc-file of the VST-EQ was nearly inverted and the highs were cutoff, the ir was completely unusable
b) the Reverb was less loud and the predelay was slightly different but it worked okay, i would say 85% match.
Maybe i am doing something wrong, i would be glad for any tipps.
My last question is about sweep-file length. My final IRs should be max 1024 Samples (21,33 ms).
So what would be the best value for the Voxengo deconvolver to setup the sweep file? 0.02 s with fades, ore am i on the wrong way? Would be glad for any tipps.
Thank You very much.
cheers - Nick
Your routine seems correct, but I would suggest you to add 1s of pre-silence as well as 1s of post-slience you've added already. If the VST EQ/VST FX is non-linear the deconvolution will fail - it works with linear filtering only.
The 6s sweep is fine. But you will have to chop-off the resulting IR file to 1024 samples - this may affect the sonic quality, of course.
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