[BUG] Delay on playback in Reaper with many NAM instances

[henrikvilhelmberglund]

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Description

Delay on playback in Reaper with many NAM instances. Whenever I press play in a project with a few instances (maybe 8 or so) there's a delay before playback. When the tracks with NAM are muted there's no delay.

To reproduce

Steps to reproduce the behavior:

1. Insert two NAM instances on a track, a pedal and amp
2. Copy this track a few times, it seems there's a linear increase in delay time so 10 tracks should be fairly obvious
3. Insert a track without effects with some kind of music or something so it's obvious when playback is started
4. Play back
   Result: There's a delay before playback is started
   Expected: There's no delay before playback is started
5. Mute all of the NAM tracks
   Result: There's no delay before playback is started

Expected behavior

There's no delay before playback is started.

Screenshots

N/A

Computer & other info

(please provide the following information):

• OS [e.g. Windows 10, macOS 10.15]
  Win 11
• Onboard graphics & version
  Geforce 5070Ti with version before latest
• Plugin version [e.g. 0.7.10]
  0.7.13
• Standalone, VST3, or AU
  VST3
• DAW (if applicable)
  Reaper v7.61
• Audio interface [e.g. Focusrite Scarlett Solo 3rd Gen]
  Roland Quad-Capture
• Sample rate [e.g. 44.1 kHz]
  48Khz
• Buffer size [e.g. 256 samples]
  128 samples
• Provide a model that the bug happens with (except if the bug happens without a model loaded) _Note: Please try using linear_10.nam
• and wavenet_minimal and check whether they work as expected._
  I tested using https://www.tone3000.com/tones/dallas-rangemaster-treble-booster-clone-hyper-accuracy-31234 V10 T10 S and https://www.tone3000.com/tones/friedman-jose-arredondo-teaser-hyper-accuracy-52652 any model with S
• Provide an IR that the bug happens with (except if the bug happens without an IR loaded)
  No IR used.
• Does the bug not happen under some other conditions? If you can find what one thing makes the difference between the bug appearing and not, this drastically improves the chances I can fix it.
  With NAM instances not processing

Additional context

Add any other context about the problem here.

[sdatkinson]

Can you check the recommended models in the Issue template and report back? Hard to tell if there's just something strange with those models or what the pattern really is.

[henrikvilhelmberglund]

Sure, my bad.

I tested with the recommended models and saw the same result though I needed way more instances (about 70 tracks with both models instead of 10). I can reproduce the issue with any standard size (~277kb) model.

[henrikvilhelmberglund]

Here are two videos from a real project without sound but the difference should be pretty obvious:

before #611 https://youtu.be/voXhNFRyLV0

after #611 https://youtu.be/sVxZW85Unuk