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ConvolveIt Input Wav Format
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April 29, 2014
7:39 pm
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kedarshashi
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April 27, 2014
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Hi, I am relatively new to RackAFX.

I had a question regarding the ConvolveIt project. I loaded the project and tested it with the LPFSIR2.wav provided. I then tested it with my own IR wav file. This was a wav file bounced from Pro Tools.

My IR returned an INVALID_HANDLE_VALUE. I figured this problem was because my file had a sampling rate of 96kHz and a bit rate of 24. So I rebounced the same IR at 44.1kHz and 16bit to match the format of the LPFSIR2.wav provided. This did not give me the INVALID_HANDLE_VALUE but returned an empty message box and proceeded to do absolutely nothing to my input audio.

I am little confused with this plugins responses to my input IRs. My instinct tells me that Pro Tools does something to the wav files that this plugin doesn't like. Any insight would be great.

Here are links to the wav files that I used. The first one is the original 96k/24bit the second is the 44.1k/16bit recording.

https://drive.google.com/file/d/0B-Ph6kCAzyI9Zk5MTEIzWjVCX2s/edit?usp=sharing
https://drive.google.com/file/d/0B-Ph6kCAzyI9cnhubFhfbjRTazA/edit?usp=sharing

May 1, 2014
8:03 pm
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W Pirkle
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January 28, 2017
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Hi kedar

Sorry for the delayed reply but we are just finishing up the semester here. Time is limited.

I opened the 16-bit 44.1k file and sure enough it failed to load, but the problem was because it's wave header was in the wrong spot - I've never seen this before. The first Riff header was named "JUNK" (which I have also never seen before). I was able to load the file by opening it in a basic editor (called Wavosaur) and then just saving it with a different name This stripped out the JUNK portion and it then opened/loaded just fine.

Notes:
1) the convolver only works at whatever sample rate your audio file (to be convolved) is. So, to convolve with a 96k WAV file you'd need to open and use a 96k file.

2) I noticed the IR file is very long, looks like a reverb IR?. Linear convolution is CPU intensive and unless you have a super-fast computer, it will most likely glitch. It will certainly not be real-time do-able with 96kHz IR files that are this long. However, you can process it offline with "Process into WAV File"

I have not done any other testing as time is short right now. I will look at this deeper over the weekend and try to get back to you Monday or so. I've only been testing with IR files that are 1024 or 4096 samples in length.

All the best,

Will

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