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Old 03-02-2020, 06:55 AM   #1
BartR
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Default [Solved]MIDI Latency about 1/4 of second. How to reduce it?

Hi

I've made an installation of Reaper on a PC of a collaborator.
It works fine except the MIDI. It has a huge latency, not present on Cubase LE installed on the same computer :-/ Same synth, same settings, same interface ...

The interface is M-AUDIO FireWire 1814 under W-10 64bit 1909

When any key of the MIDI keyboard is pressed, the MIDI command is taken immediately but the sound is emitted about 1/4 later
I did try to change the buffer settings in the Options > Preferences and so on, but it wont change :-/

Is there any way to reduce this latency please?

Thanks a million in advance for your help
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Last edited by BartR; 03-06-2024 at 05:20 AM.
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Old 03-03-2020, 06:00 AM   #2
Nana
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Do you see the blip of the incoming Midi message for the track on the mixer?
If that is not delayed, it may just be the audio device driver causing the latency. Especially ASIO4ALL makes such things, because if buffers are enabled there and on the WDM kernel driver, they just add up latency on both stages.

The solution could be to try WASAPI oder some other ASIO layer, like FlexASIO, if no device native ASIO driver is available.

If the blip is delayed, it is often due to an incorrect MIDI driver. This also happens if there are virtual port replicators or virtual MIDI wires hanging around in the system.

Does the FireWire driver run in isochronous mode? If not, there are many sources of latency on that. Try reinstalling or updating the driver to the specific host hardware driver, not the generic Microsoft driver.
If you have hardware for IEE 1394b or upwards, try limiting the driver settings to 1394a only. If the setting is 1394 without "a", try 1394a, if available.
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Old 03-05-2020, 11:26 AM   #3
BartR
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Quote:
Originally Posted by Nana View Post
Do you see the blip of the incoming Midi message for the track on the mixer?
If that is not delayed, it may just be the audio device driver causing the latency. Especially ASIO4ALL makes such things, because if buffers are enabled there and on the WDM kernel driver, they just add up latency on both stages.

The solution could be to try WASAPI oder some other ASIO layer, like FlexASIO, if no device native ASIO driver is available.

If the blip is delayed, it is often due to an incorrect MIDI driver. This also happens if there are virtual port replicators or virtual MIDI wires hanging around in the system.

Does the FireWire driver run in isochronous mode? If not, there are many sources of latency on that. Try reinstalling or updating the driver to the specific host hardware driver, not the generic Microsoft driver.
If you have hardware for IEE 1394b or upwards, try limiting the driver settings to 1394a only. If the setting is 1394 without "a", try 1394a, if available.
Unfortunately I didn't find any way to change the 1394 to 1394a :-/
In fact it is like you say. When the key is pressed, the blimp is immediate but the sound goes out almost 0.5 seconds later ...
The issue is: with Cubase LE it didn't occurred, but only with Reaper.
The guy to who I installed Repaer, is very enthousiast of it, and he doesn't want to be back at all to CB :-) (I fully understand him :-) )

So, perhaps the only one way for him, is to change the Audio Interface ...
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Old 03-06-2020, 04:31 PM   #4
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Double check the native ASIO driver is installed for the device, if it's still supported. Also, check in Cubase what Audio interface was selected - i.e check whether it was using ASIO and, if so, what ASIO driver.

Then double double check that Reaper is using the same driver with the same settings.
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