@FractalAudio The following is my humble summary of the bug report here, according the list of your bug reporting guideline.
(I used Gen-AI agent NotebookLM with the configuration to disable learning from the input. I believe there's no data breach issues as this thread is itself an open-source information, but apologies in advance if I've violated any rules/policies on Gen-AI.)
@boyce89976 Kindly review if the following corresponds to your issues/intended reporting contents and correct if necessary.
Summary of the "Zombie Reverb Burst" Bug Report
1. Post the example presets.
The following individual presets were provided by the primary reporter and others investigating related phenomena:
•
Presets from Primary Reporter (boyce89976) (Axe-Fx III, used for switching between songs):
◦
S1 - Matchless DC30 EF86 LoGa_20251013_114325.syx
◦
S2 - Matchless DC30 EF86 LoGa_20251013_140641.syx
◦ These two presets are described as the
same setup saved with different tempos.
•
Other Related Presets Provided in the Thread:
◦
59 Bassguy.syx (from user strabes, related to channel switching investigation)
◦
Zombie.syx (from user ARF, related to similar delay issues)
◦
Reverb burst test.syx (from user Randall d, related to scene switching on an FM3)
2. Do NOT post a preset bundle.
This requirement was met by the reporters, as all presets were provided as individual .syx files.
3. Simplify the preset as much as possible. Remove any blocks that are not relevant. Disconnect any irrelevant modifiers.
4. Unlink all blocks from global blocks.
The sources
do not confirm if the primary reporter fulfilled requirements Q3 (simplification) or Q4 (unlinking global blocks).
5. Use factory cabs if possible.
The primary reporter addressed the cab requirement (Q5), stating they had to
replace a purchased IR with a stock IR in order to post the S1 preset.
6. Include clear and concise instructions on how to recreate the bug.
The central challenge noted by the primary reporter (boyce89976) is that the "zombie reverb burst" is
random and
not consistently recreatable. It happens "maybe once every three or four songs". The effect is described as a
short burst of reverb that sounds like a small chord.
Instructions for Primary Scenario (Preset Switching):
1. Play through Preset 1 (e.g., S1 - Matchless DC30 EF86 LoGa).
2. Switch to Preset 2 (e.g., S2 - Matchless DC30 EF86 LoGa) using an
FC12 preset change.
3. The burst occurs randomly, coinciding with the preset change tap.
Specific Preset Context (Applies to S1 and S2):
• The preset uses the
Golden Plate reverb model in two channels (A and C).
• The issue still occurs, though less frequently, even when global
Spillover is turned off.
• Channel A decay is set to 3 seconds; Channel C decay is set to about 7 seconds.
Alternative Replication Scenario (Scene Switching, FM3 reported by Randall d):
1. Load the Reverb burst test.syx preset with Spillover on.
2. Play on Scene 1.
3. While the Reverb is still decaying, switch to Scene 2.
4. Play a bit, then stop playing.
5. After stopping for a few seconds, switch back to Scene 1 (without playing). This sometimes results in a reverb burst.
7. Indicate the firmware version you are using.
The primary reporter (boyce89976)
did not indicate the firmware version of the Axe-Fx III being used for the problematic presets (S1, S2).
• In related reports:
◦ User ARF reported a delay issue on
FW 29.01.
◦ User Randall d reported a scene switching test on an FM3 using
FW 10.00.
