[solved] Convolver and long IR files

Help, Support & Bugs
1

I’ve been using the Convolver a lot in the last couple days and there seems to be a problem when using long IR files. I get crackles and a significant increase in cpu-load for any file longer than ca. 15 seconds.

The increase in cpu-load seems logical (maybe not in that extent), but the crackles are really annoying.

Here’s a IR that demonstrates it: Very long IR

granted, this is an extremely long IR and pretty much an exeption, but files like these work fine in other Convolving reverbs i use (the SIR2 and Abletons Convolver Pro).

so is there a maximum length of files that can be used flawlessly in Convolver? Is this a bug?

2

I had no trouble with that file, actually.

Do you have a problem with it when you render-down?

(I’m using 64-bit Renoise, 3.0.0b8 on Arch Linux - Core i5 i5-4670Km 16 gigs of ram BUT I have a ton of other stuff running in the background, using much of my memory).

I’m VERY curious of the following:

  • Are you on 32 or 64 bit?
  • Does the problem exist when rendering?
  • What beta sub-version of Renoise are you using?
  • What is your processor?
3

weird…

will try the rendering and report back. doesn’t really make much sense to me though - if i can’t even hear the reverb because of the crackles i wouldn’t use it in a track anyhow. thankfully it’s just a bunch of IRs misbehaving.

i’m on windows 7 64Bit (using the 32Bit version of Renoise though)
Renoise 3 is installed in Beta 8 atm
processor is rather oldish, a dual-core 2.3GHz

i realized it gets better when i increase ASIO buffer size but some (very few) IRs still won’t work correctly.

still buggers me though. as mentioned before i have no troubles at all with other convolving reverbs.

4

Interesting.

So - I have a similar experience. Works great on my fairly-fast Core i5 Linux system, 64 bit.

Same IR file on my Windows XP, Older Athlon X2 4200+ - 32 bit? Noisy, glitchy, on longer IR files.

Increasing the ASIO buffer size resolves the issue. You should definitely take a look at CPU usage, though.

I do think it’s interesting you have good luck with other colvolvers and not with this - it does mean maybe there are some performance issues with the Renoise convolver.

But, honestly, I’m not surprised meynearly-10-year-old XP workstation doesn’t have a lot of luck with these longer impulse files. In fact, posting this message is the last thing I’m doing on it before I swap out the motherboard with a new(used) Core 2 Quad one. =]