Vember Audio Surge is now open-source

[EvilDragon]

Correct, you cannot adjust output of the waveshaper if it's between the two filters. This is not easily fixable now but is going to be in XT2.0, whenever that happens. BTW you can extend the range of waveshaper gain slider when you right click on it, giving you +/-48 dB range.

We cannot touch reverb filtering without breaking existing patches, I think. IIRC the damping is pretty full range, so the cause for low damping might be something else. I'll look into it.

Osc phase adjustment is also not happening before XT2.0 for a bunch of internal reasons...

I am not sure I can reproduce the last thing you mention with classic/WT osc types. If I have one which retriggers and another which doesn't and no unison on either one of them it definitely sounds like one of the in is not retriggering because I do hear the phasing....

[Andreya_Autumn]

For the last one, you're probably observing the fact that the switch is (in my opinion) mislabeled. It says retrigger (implied: on/off) but what it really does is at note on set phase to 0 vs. to random. In most voice modes that's a more useful switch to have but perhaps like me you'd like a fully clickless note change in legato mode, and have found it elusive. This is why.

Anyway, we have that logged: https://github.com/surge-synthesizer/surge/issues/7945 also as an XT2 change since it affects existing sounds.

[EvilDragon]

Yeah as we discussed in that issue, it's not mislabeled, it's how a huge majority of synths do it (including hardware digital synths).

[Surgo]

Hey folks, some exciting news coming to the next release of Surge XT. We've been cooking up a convolution effect so you can load and convolve impulse responses right in the Surge FX chain.

As part of this feature, we will be shipping a library of impulse responses with Surge like we ship a library of wavetables. However, to make this a reality, we need contributions! So consider this a request for contributions. Do you have some high-quality impulse responses you'd like to see in Surge? If so, please PM me directly. Some examples of what we're looking for, but not limited to: interesting spaces or reverbs, guitar speakers, musical instrument bodies.

The fine print: we will distribute these impulse responses under the factory category in the dropdown menu. You will be credited on the About screen. They will be CC0 licensed, so please ensure you are comfortable with that and are capable of granting such.

[brok landers]

A question:
Can i modulate a modulation amount, if the modulation assignment is made via the modulation tabs?
An example:
I want the filter env to control both the cutoff and the resonance. And then i would want to scale those two assignments via velocity. So what i do is the following:

- i use the filter eg for the filter cutoff. This has its own amount slider.
- i scale the amount slider with velocity by assigning it with the velocity modulation tab.
- i use the filter env also to scale the resonance via the filter env modulation tab.

Here's the catch:
as i _directly_ modulate the cutoff with the filter env and scale it _indirectly_ with velocity (by assigning velocity to the filter env amount slider), the _indirect_ velocity assignment of the filter env amount modulation doesn't scale the resonance, which is also is modulated by the filter env (by the filter ev modulation tab). But then the velocity only scales the filter env --> cutoff. So i would have to make a modulation assignment for the velocity to also control the filter env amount on the resonance.
So essentially i would have to make a modulation assignment to the env amount that scales the resonance via the filter env - which has to be done in the modulation list.
Basically i want to achieve:
- low velocity = low filter env amount on the cutoff and low filter env amount on the resonance.
- high velocity = high filter env amount on the cutoff and high filter env amount on the resonance.
Can i do that - and if so - how?

I hope my limited english was able to make you understand what i am trying to achieve.

[EvilDragon]

You can use Env or MSEG mode of the LFO instead of Filter EG, then you can modulate the LFO amplitude with velocity.

[planetearth]

Hey folks, some exciting news coming to the next release of Surge XT. We've been cooking up a convolution effect so you can load and convolve impulse responses right in the Surge FX chain.

As part of this feature, we will be shipping a library of impulse responses with Surge like we ship a library of wavetables. However, to make this a reality, we need contributions! So consider this a request for contributions. Do you have some high-quality impulse responses you'd like to see in Surge? If so, please PM me directly. Some examples of what we're looking for, but not limited to: interesting spaces or reverbs, guitar speakers, musical instrument bodies.

The fine print: we will distribute these impulse responses under the factory category in the dropdown menu. You will be credited on the About screen. They will be CC0 licensed, so please ensure you are comfortable with that and are capable of granting such.

I'm sure this is fairly obvious to most people here, but you might want to remind potential contributors that these impulse responses must be original. They can't be IRs people found on their hard drive (after forgetting where they downloaded them from years ago), and they obviously can't just submit a bundle they got from a "free IR" site.

Again, I'm sure that's obvious to most people, but in the interest of saving yourself a lot of work sifting through dozens of IRs of Bricasti and Lexicon reverbs and Marshall amps that you know aren't original, you might just want to take 30 seconds to mention it in your call for contributions. "Capable of granting [a CC0 license use]" may not be sufficient. A lot of people in 2025 grew up with the idea that "anything on the Internet is free to use or copy". I'm just suggesting you CYA while looking for CC0s.

Steve

[EvilDragon]

Yes, that is absolutely correct, and of course we would want to have the licensing cleared before accepting contributions!

[audiojunkie]

Hey folks, some exciting news coming to the next release of Surge XT. We've been cooking up a convolution effect so you can load and convolve impulse responses right in the Surge FX chain.

As part of this feature, we will be shipping a library of impulse responses with Surge like we ship a library of wavetables. However, to make this a reality, we need contributions! So consider this a request for contributions. Do you have some high-quality impulse responses you'd like to see in Surge? If so, please PM me directly. Some examples of what we're looking for, but not limited to: interesting spaces or reverbs, guitar speakers, musical instrument bodies.

The fine print: we will distribute these impulse responses under the factory category in the dropdown menu. You will be credited on the About screen. They will be CC0 licensed, so please ensure you are comfortable with that and are capable of granting such.

I'm sure this is fairly obvious to most people here, but you might want to remind potential contributors that these impulse responses must be original. They can't be IRs people found on their hard drive (after forgetting where they downloaded them from years ago), and they obviously can't just submit a bundle they got from a "free IR" site.

Again, I'm sure that's obvious to most people, but in the interest of saving yourself a lot of work sifting through dozens of IRs of Bricasti and Lexicon reverbs and Marshall amps that you know aren't original, you might just want to take 30 seconds to mention it in your call for contributions. "Capable of granting [a CC0 license use]" may not be sufficient. A lot of people in 2025 grew up with the idea that "anything on the Internet is free to use or copy". I'm just suggesting you CYA while looking for CC0s.

Steve

CYA -- One of the best things I ever learned in my career! CYA has saved my bacon many times!!

[Surgo]

So far I haven't had to worry about it, since I've received 0 contributions from this thread as of yet.

I thought it was implied but I'll lay it out specifically: you must be able to grant us the CC0 license. For almost everyone here, that means you created the IR.

[planetearth]

So far I haven't had to worry about it, since I've received 0 contributions from this thread as of yet.

I thought it was implied but I'll lay it out specifically: you must be able to grant us the CC0 license. For almost everyone here, that means you created the IR.

That was actually part of my concern: Most people don't know how to make their own IRs, especially if they don't have physical access to the tools and spaces or gear they might want to capture. So while it may take a few days of keeping this thread active before enough people see it to contribute, it still wouldn't be worth the time if all you received were IRs of spaces or gear we know most people don't have access to.

Steve

[Andreya_Autumn]

It is true that most people don't regularly make their own impulse responses. But it isn't actually that hard!

I had a couple laying around from way back when. And yesterday I made a few out of some analog gear I have (a BX15 and a RE-501) which turned out if nothing else really characterful. Doesn't seem that far fetched that someone else here is sitting on something that the community could appreciate. Don't be shy folks.

And if you have access to a room or some gear that in your opinion has a nice sound, but aren't sure how to go about this. Feel free to ping me here or shout on the Surge discord. Or just google it. Tons of Youtube videos on the subject.

[uOpt]

That was actually part of my concern: Most people don't know how to make their own IRs, especially if they don't have physical access to the tools and spaces or gear they might want to capture. So while it may take a few days of keeping this thread active before enough people see it to contribute, it still wouldn't be worth the time if all you received were IRs of spaces or gear we know most people don't have access to.

So how would I go about making my own IRs to contribute? I have a few amps and speakers that might be interesting, plus suitable microphones.

[Andreya_Autumn]

So how would I go about making my own IRs to contribute? I have a few amps and speakers that might be interesting, plus suitable microphones.

Set the speaker and mic up as if you were recording anything else. Then somehow playback either a sine sweep or a full-spectrum transient through the amp and record the output of that. Then send us the recordings. Both the recordings of the amp and whatever impulse file you used to make them (so we can deconvolve as needed).

You can put it here in this thread, or DM to me, Surgo or EvilDragon. Or join our Discord and post there.

We have some great non-standard reverbs already, the aforementioned springs/tapes, piano strings, and one very unusual large space etc etc. What we don't yet have is some more conventional reverb tails and also things like Amps/Speakers. So if you want to contribute some in that last category that would be great!

[planetearth]

Thanks, @Andreya_Autumn!

Steve