Timing issues with DP MIDI & EastWest QLP

[Renaissance Man]

When using EastWest Quantum Leap Pianos as a VI in Digital Performer, I've recently noticed some odd timing issues. Specifically, on a given piano chord with all notes at exactly the same starting point ( whether the MIDI notes have been quantized or moved manually ) the notes will still not sound at exactly the same moment.
If however I route the MIDI to an external sound module, for instance my Kurzweil K2600 keyboard, the notes in the chord DO sound at the exact same time.
I'm wondering if anyone else has encountered this or has any ideas.
Thanks

[Shooshie]

I wonder if that could be a latency issue in the particular VI you're using.

Shoosh

[Renaissance Man]

This is odd. I can loop a chord (one that stands out as being particularly bad or easy to spot) and part of the time all the notes sound simultaneously, part of the time they don't.
I'm watching the meters in QLP - I'm using 2% of the CPU, a high of 40 MB/s of the DISK, a high of 21 VOICES, and it's assigned 287 MB of RAM. QLP isn't even breathing hard...

[HCMarkus]

The dreaded "humanization" parameter?

I dislike such labels. I'm human enough; don't need a programmer making me less me and more him.

[Renaissance Man]

What Shooshie said about latency got me exploring my settings. Eventually ended up in Set Up > Configure Audio System > Configure Hardware Driver and found my Host Buffer Multiplier was set on 2. Set it down to 1 and it stopped QLP's errant behavior.
Always has to be something stupid simple...

[Shooshie]

What Shooshie said about latency got me exploring my settings. Eventually ended up in Set Up > Configure Audio System > Configure Hardware Driver and found my Host Buffer Multiplier was set on 2. Set it down to 1 and it stopped QLP's errant behavior.
Always has to be something stupid simple...

Ah yes, I've encountered that in the past. I wish I could remember to suggest it when I hear of this problem. Glad you found it, and thanks for returning and posting your answer.

Shooshie