Surge XT Effects VST3 not recalling parameters between sessions in Renoise

[subtractor303]

The plugin is always reset to the Delay effect and all parameters are reset when reloading a project file, forcing me to record the audio in order not to lose progress.

Surge XT Effects 1.3.4 64-bit VST3
Renoise 3.5.4 64-bit
GNU/Linux Debian 13 (Trixie) / KDE Plasma

How to reproduce:
01: Insert Surge XT Effects VST3 on any channel
02: Change effect type to, let's say, Vocoder.
03: Alter parameters.
04: Save module (.xrns)
05: Reload the module (close Renoise / reopen module)
06: Open the Surge XT Effects instance and inspect parameters

I expect the plugin to recall parameters between sessions, otherwise it isn't usable, especially when many instances are present.

Screencast_20260122_192453.webm

[Andreya-Autumn]

Hello and thanks for the report! Tagging as Linux since we haven't heard of this happening elsewhere.

I'm guessing this is Renoise doing the get/set state procedure on startup differently than other hosts, but hard to say for sure. Remind me again, is Renoise Linux only or are there Mac/Win builds available? This seems like it'd be hard to test without running in the host in question.

[subtractor303]

Hello and thanks for the report! Tagging as Linux since we haven't heard of this happening elsewhere.

I'm guessing this is Renoise doing the get/set state procedure on startup differently than other hosts, but hard to say for sure. Remind me again, is Renoise Linux only or are there Mac/Win builds available? This seems like it'd be hard to test without running in the host in question.

Renoise is available on Windows, macOS and Linux (arm64 and x86_64).

https://www.renoise.com/downloads

[baconpaul]

I have an NFR of renoise (I'm running 3.5.2) so can look

I've had some problems with renoise and vst3 with air win but nothing like this. Lemme peek this weekend.

[baconpaul]

Just checked

with 3.5.2 on my mac I loaded the XT effects set it to chorus, changed params, saved, quit, restarted renoise, loaded, and it was fine.

So need to poke more.

Can you upload a renoise session (ideally small) with an XT effects which doesn't restore for you @subtractor303 ? (you may need to zip it to attach it to GitHub)

[subtractor303]

Just checked

with 3.5.2 on my mac I loaded the XT effects set it to chorus, changed params, saved, quit, restarted renoise, loaded, and it was fine.

So need to poke more.

Can you upload a renoise session (ideally small) with an XT effects which doesn't restore for you @subtractor303 ? (you may need to zip it to attach it to GitHub)

xtfx.zip

I included a screenshot of what it looked like at the point of saving.

[subtractor303]

I noticed something interesting:

whatthe.webm

[baconpaul]

The oddity is the params change when you open the ui?

[subtractor303]

The oddity is the params change when you open the ui?

Even weirder than that. It recalls just fine if I hit play before opening the plugin UI, but it doesn't recall if I open the UI immediately after reopening the project. Very odd.

Screencast_20260123_045601.webm

[baconpaul]

Sounds like something is letting the defaults override the engine when theUI opens

will see if I can repro here on mac in other hosts.