Incredibly loud distorted high-pitched sound when opening Surge-XT on Fl Studio 20

[ImNitro]

Bug Description:
As the title says, I'm getting an incredibly loud distorted high-pitched sound when opening Surge-XT, semi-randomly. Sometimes I can open one or two instances of the plugin without it but it always happens eventually (to a maximum of 2 instances open at the same time). If I do manage to get an instance without the sound, reseting fl studio or changing any ASIO-related audio settings brings it back. Sometimes the sound completely replaces all noise output from the plugin, but sometimes I'm able to still play notes.

The pitch and intensity of the sound seems to decrease very slightly when I increase my ASIO buffer length. (Focusrite USB ASIO with scarlet solo 3) The maximum buffer of 1024 does not remove the issue, and the decrease in volume is slight. (it's still deafening) The noise still occurs if I don't use an ASIO or if I use a different one. (I tried ASIO4ALL and the default FL Studio one)

Changing the ASIO settings such as Mix in Buffer Switch and Triple Buffer temporarily alleviate the issue but only when opening a new instance of the plugin immediately after. Any change to these settings makes all of the instances open (even ones that didn't previously make the noise) make the noise again.

Changing the volume of the vst using the volume knob in fl studio has no effect on the noise until it is at 0%, and then it cuts out completely. However, I CAN change it's volume by routing it to a mixer track and changing volume there or by using a limiter.

This issue only happens with Surge XT, and not any other third party or image-line vst. I have tried reinstalling the plugin a few times and reinstalling my ASIO drivers to no effect. Surge 1.9.0 does not have this issue at all, and I can open as many instances as I want.

Version Stuff:
Version: Surge XT 1.3.4.f7b97c6
Build Info: 2024-08-11 @ 16:02:24 on 'fv-az292-728/pipeline' with 'MSVC-19.40.33813.0' using JUCE 7.0.12
System Info: Windows 64-bit VST3 on AMD Ryzen 7 5800X3D 8-Core Processor, 32 GB RAM
Host: FruityLoops @ 44100 Hz
Processing Block: 32 samples

• Windows 10
• FL Studio Version 20.6.2

Reproduction Steps:
Open the VST.

[Andreya-Autumn]

Ouch! That's very strange and very not good.

From the description of the problem alone, I would've guessed it's a feedback issue somehow. That doesn't seem probable, but just to check: Any chance you load Surge with a default preset which uses Audio in? And if yes, any chance that audio in gets put in a feedback loop somehow?

I'm guessing that's not it though. In which casse, can you do me a favor? Download an older version of Surge (say, 1.2.3) and see if the issue still occurs: https://github.com/surge-synthesizer/releases-xt/tags

[mkruselj]

Could be the fact that FL Studio by default enables all inputs and outputs (see plugin wrapper)?