Using convolver universally in HTPC

**pakru** · **07-31-09, 02:47 PM**

Hi antani,

I just bought an e-mu 1616m pci, and it is on its way. Reading other forums, it looks like the patchmix is confusing for new users and going to be a challenge to setup. Is it possible for you to post a screenshot of your patchmix setup, for my reference?

Thanks again!

edit: I am reading in another thread :
http://www.hometheatershack.com/foru...on-needed.html

that there are some problems calibrating the mic with e-mu. Did you face any issues in your setup. Any experiences shared would be great. Thanks!

**antani** · **08-01-09, 03:33 AM**

I configured the Patchmix long ago, however I remember I created multiple Asio send/return. This is how the Patchmix looks like:

I did not use the EMU for measurement so I can't tell if there are problems with the calibration.

**pakru** · **08-01-09, 10:44 AM**

Thanks! Appreciate it.

**Theeagle** · **09-06-09, 10:25 AM**

Hi Guys
I have created a couple of FIR filters using DRC but I'm having trouble with the delay when using console and convolver.

When loading my FIR filter I'm experiencing a delay around 1.5 s. Shouldn't it be possible to process the filter in (near)real-time?

My configuration is:
EMU 0404 soundcard -> all sound is being sent to ASIO in
Console (VST-host) -> picks up the ASIO-in signal
Convolver - processes the FIR filter (131072 taps stereo filter in 44100 hz)
Console -> forward the sound to the ouput

From this link I found the following information concerning the delay associated with the use of FIR-filters:
(links removed due to restrictions)
given a FIR filter which has N taps, the delay is: (N - 1) / (2 * Fs), where Fs is the sampling frequency

If this information is correct, the 1.5 s delay is just a result of my pretty huge FIR filter. I just wonder, cause in foobar with convolver I haven't noticed this delay at all, and I felt pretty sure that it should be possible to process a FIR filter in (near)real-time.. But I might be wrong?

Anyone who can confirm if a fir filter can be processed in real-time or not? And perhaps know a solution

Thanks a lot!

**franklafond** · **09-15-09, 08:38 AM**

Theeagle, have you set the "partitions" parameter to 16 (max value)? The greater the number of partitions, the lower the latency. It is variable as more partitions require greater processing power, but I've not had any problems setting it to 16. This should drop your latency into the millisecond range.

**Theeagle** · **09-20-09, 06:53 AM**

Franklafond - thanks a lot

You was totally right, I just missed the "partitions" settins, it was set at 0 partitions. Can't believe how many hours I have been messing around with this, just to realise the only thing I was missing was the partition settnins...

Oh, by the way.. I can set the partition as high as i want, but at around 1500 partitions my CPU can't handle it anymore

**franklafond** · **09-20-09, 07:54 AM**

Great, I'm glad that worked. I too spent hours of frustration until I figured it out. Then sometimes the host (VSTHost) would "forget" the settings and I'd have to reset the values (after it dawned on me what the problem was).

How did you get partitions > 16? Is there a config file you modified directly, or is there another interface you used? The VST version I've used does not allow direct number entry through the GUI. Fortunately 16 seems to be enough to lower the latency to an acceptable range. Of course more is always better. ;-)

**Theeagle** · **09-20-09, 08:06 AM**

I can just change it in the GUI...

I'm using Console v. 1.6.2 (beta) and the VST plugin "Convolverfilter" (from http://convolver.sourceforge.net/)

**doctorcilantro** · **10-21-09, 01:26 PM**

Great to see this thread is active. For some time I have been preparing to finally analyze my room. I had an ECM8000 a year ago but we moved and I sold the mic.

I'm planning on purchasing a calibrated ECM8000 soon, and then trying to figure out how to push the result to VST.

My applications:

Lossless audio playback (2channel) - J. River Media Center now accepts VST in the 32bit internal DSP chain
(Emu 1616M>Peachtree Nova>6BM8 2 channel tube power amp)

Realtime Digital RIAA implementaiton - Samplitude 10 (VST plugins for 24/96 highly accurate RIAA)

I currently feed the vinyl in through the EMU1616M and feed it right back via ASIO to Patchmix after Samplitude applies the RIAA curve.

I need to study up on methods to push the REW results to a VST plugin...I think Voxengo makes one but would like to hear from anyone regarding this as I'm getting into uncharted territory a bit here.

thanks! Great to be here.

DC

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