LP EQ causing missing AD drum samples

I tried using the LP EQ (not the older LP-64, but the newer one) on the master bus, and as soon as I inserted it I noticed that my AD drums had over half the hits become inaudible. I raised my buffer size from 256 to 512 (both in Sonar and on my RME Fireface), and some missing hits returned, but not all - still some missing. Tried buffer size 1024 and still the odd missing sample... As soon as I took the LP EQ off the master bus everything was fine again.
 
CPU usage reading as only about 7% for whole project. Not a big project  - actually just a demo project trying out different plugins, only a few tracks. I use AD drums in all my projects requiring drums, never a problem. I create much larger projects without a problem. I never go over 256 buffer size unless doing huge orchestral projects.
 
Anyone else had similar issues with this plugin?

FWIW i had the same problem, until disabling that plugin, all works fine now.

And don't use it on every channel. That's not what it was designed for.

I find them good to work with although a bit intensive, perhaps a minimum phase option could be added later to lighten the load or indeed does it do this already. If you go into the Expert settings and turn the mode to Non-Linear that should save CPU cycles.
 
One instance of LP EQ cost around 1.x% audio time in non-linear mode. In High Linear it was only marginally higher by about 0.4%.
 
LP MB cost around 4.6% here in non-linear mode with High Linear mode being around 6.5% so definitely not one to throw on tracks casually unless you are running some sort of super hybrid studio DAW workstation.
 
By the way, I am using an Athlon x6 3200Mhz, 8GB of PC1600 RAM and a Focusrite ASIO driver.
 
 

Dilaco1
I put it on the master bus only. Only one instance. No spike in CPU.
 
I raised buffers as described in original post. No effect.
 
It was only a small demo file of a few tracks.
 
Like I said, I have run much larger projects on my machine with lots of plugins (most third party) with no problem.
 
It is simply a case of: Addictive Drums hums along fine; I put the LP EQ on the master bus and samples go missing; I take LP off the bus and everything’s fine.

But did you raise your midi buffer lookahead to 500ms???
Not the same as audio buffers.

^^^ There's your solution. The issue isn't unique to the LPEQ, but can occur with any linear-phase equalizer.
 
One of many reasons behind the time-honored best-practice of holding off on mastering until the tracking phase is complete. Ideally, when you enter the mastering phase you're working exclusively with audio. (The operative word is "ideally". I violate the rule often!)

Thanks everyone for your enlightening suggestions.
 
Raising MIDI buffer times is something I confess to have known little about. I had thought that doing so would make the MIDI tracks lag behind, as the buffer is measured in milliseconds. 1000 ms sounds like a lot. So I did some tests bouncing to track an Addictive Drums clip, and then playing it back alongside the un-rendered AD MIDI track.
I bounced with the MIDI buffer at 250. I played back and there was no phasing between the two tracks (flipping the phase on the audio track cancelled some of the audio, with some still passing through). Then I raised the MIDI buffer to 1000ms and played back. I couldn’t hear any difference. There was no phasing. So I will be keeping the MIDI buffer higher than the default, maybe at 500?
 
By the way, my original post was really to find out if the LP EQ was buggy or had issues because I was looking at buying a professional mastering EQ. Normally I wouldn’t master MIDI – that is, I wouldn’t do a final master with un-rendered MIDI tracks. I was just doing a demo with different plugins, and it was the first time I have tried the LP EQ. Maybe I will use the LP EQ after all instead of spending more money...