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Old 09-12-2017, 03:13 PM   #1
MixR
Human being with feelings
 
Join Date: Jan 2017
Location: London
Posts: 328
Default [Solved] Reaper Live Mixer Delay Comp Problem - please help!

I am trying to run Reaper as a processing machine on a slave computer connected to my main computer via MADI. The idea is to process live inputs with AU/VST plug-ins - treating Reaper as though it was a multichannel FX box connected to my Pro Tools HD rig. All tracks are monitoring input, there is no playback of any kind (Audio/VI). No recording is taking place.

Here is the problem:
When I try to use plug-ins that report a delay other than zero the whole thing falls apart. The PDC is not working as expected: The live audio on the tracks with zero latency plug-ins is not compensated (delayed) to remain aligned with the audio on the track with the extra plug-in delay.

The manual says this under 6.17 Plug-In Delay Compensation:

"For example, a display of 256/512 spls would mean that one of the FX requires a latency of 256 samples: REAPER rounds this up to a number of blocks based on your buffer size. All other tracks will be delayed to match the track with the greatest latency."

This is not true for live audio tracks. Presumably Reaper only delays playback tracks correctly?

I am new to Reaper and may well be overlooking something here. But it seems that there is no such thing as an Aux track so in order to monitor live audio through plug-ins I have to use track arm and input monitor?

Any help appreciated!

Last edited by MixR; 09-19-2017 at 02:53 AM. Reason: making clear that no recording is taking place
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