I am curious. I did a little test to see how much real world latency I was getting. I set up a drum sound on my Korg M1 and one in EXS on a Direct TDM track using the Emagic System Bridge. Then I put one output from the M1 into one side of my MD recorder and the an output from the VSTi drums into other side. I then set the MD to record and I pounded on my M1 keys. I then took the drums that were now recorded the on the MD and ran them back into a Stereo DAE track in logic. Then I opened the Logic sound file in the sample editor and highlighted the space between the attacks of the sounds on the left side from the M1 and those on the right side coming from the M1. While you hold the cursor down you can see the length of the highlighted region displayed as a number of samples in the upper left part of the sample editor. I was using the latest 128 sample digidesign stream manager and had all buffers at the minimum settings. I found the delay between the M1 sound and the battery sound was about 700 to 1000 samples. Not too wonderful really. The comparative responsiveness of the M1 is very noticable to me which is what prompted me to do the test. Is anyone else willing to do the same test on their rig using whatever soundcard they have (RME, MOTU, M-Audio etc.) compared to the direct outs of their hardware synth and share the results here?

I did this with my K2000 using the keyboard to locally trigger a kick and snare there, and via midi to Sampletank in Logic. I sent both into Paris - the VSTi kit went in via SPDIF from an RME Digiface on the Logic machine, and the K2000 went in analog (shouldn't be more than a couple of samples difference due to converters, clocking, etc.) I repeated this for 3 different latency/buffer settings on the Digiface: At 1.5ms/64: the K2000 was from about 20 (0.4ms) to 76 (1.7ms) samples (44.1k) ahead of the VSTi. At 3ms/128: the K2000 was about 58 (1.3ms) to 120 (2.7ms) samples ahead of the VSTi. At 6ms/256: the K2000 was around 225 (5.1ms) to 250 (5.6ms) samples ahead. These are just a couple of reference measurements and don't constitute accurate averages. Midi has a natural timing delay and deviation, as is quite noticeable here. These are expectable relative delays, and right in line with the latency/buffer settings for the RME card. Regards, Dedric --- In logic-users@y..., Dennis Gunn <dennisg@a...> wrote: > I am curious. > > I did a little test to see how much real world latency I was getting. ------ > I was using the latest 128 sample digidesign stream manager and had > all buffers at the minimum settings. > > I found the delay between the M1 sound and the battery sound was > about 700 to 1000 samples. > > Not too wonderful really. ------ > Is anyone else willing to do the same test on their rig using > whatever soundcard they have (RME, MOTU, M-Audio etc.) compared to > the direct outs of their hardware synth and share the results here? > > >

--- In logic-users@y..., Dennis Gunn <dennisg@a...> wrote: <quotes trimmed by Admin> > I found the delay between the M1 sound and the battery sound was > about 700 to 1000 samples. > > Not too wonderful really. > > The comparative responsiveness of the M1 is very noticable to me > which is what prompted me to do the test. > > Is anyone else willing to do the same test on their rig using > whatever soundcard they have (RME, MOTU, M-Audio etc.) compared to > the direct outs of their hardware synth and share the results here? I have been exploring Logic for the first time and can hear significant delay between just two VSTis (Battery and for example VB1, which are concrete tight in same setup in cubase 5) playing on the same beats (notes just edited in - no external midi controller or anything). I tried with soundmanager as well as my USB audio interface ASIO driver (Maudio). Is this related to your query, or just an artefact of me not understanding Logic yet?! ch

Very interesting stuff Dennis... Just tried the same here... K2600 vs EXS Unitor8 serial Rme Hammerfall Dsp at 64 ASIO block size (1.5ms) I recorded the monitor out from HDSP digiface and the mix out from k2600 on the MD deck. EXS is around 200samples (4/5ms) later than K2600.. But: this is an unrealistic check... Most users (at least me) will use a master midi keyboard, then route midi trough logic and back to the midi module, adding a small delay due to unitor, logic and especially the sound module processing the event.. So i measured that value too. I set up the K2600 to transmit both to midi port and directly to channel1, then i routed in logic the midi data back to channel2 where an identical sound was set up. Then i recorded channel1 sound to the L, and channel2 sound to the R (using separate audio jacks on the k2600). Surprise surprise... the delay between straight playing K2600 and routing trough logic was 178 samples.... This means that in a "normal" setup the difference between playing EXS and playing is around 40 samples? I recorded on MD the sound from EXS to L, and K2600 to R (using k2600 as master and logic as router)... 38 samples! :)) Isn;t this amazing? Andrea ----- Original Message ----- From: "Dennis Gunn" <dennisg@...> Sent: Saturday, March 02, 2002 4:47 AM Subject: [LUG] GEN: Hardware VS VSTi Latency > I am curious. > > I did a little test to see how much real world latency I was getting. <quotes trimmed by Admin> > I found the delay between the M1 sound and the battery sound was > about 700 to 1000 samples. > > Not too wonderful really. > > The comparative responsiveness of the M1 is very noticable to me > which is what prompted me to do the test. > > Is anyone else willing to do the same test on their rig using > whatever soundcard they have (RME, MOTU, M-Audio etc.) compared to > the direct outs of their hardware synth and share the results here?