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Synth1 Librarian

Instrument Management and Database Plugin by Neutrino Sky
Synth1 Librarian Synth1 Librarian Synth1 Librarian Synth1 Librarian Synth1 Librarian Synth1 Librarian Synth1 Librarian
Synth1 Librarian by Neutrino Sky is a Virtual Instrument Audio Plugin for Windows. It functions as a VST Plugin.
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Synth1 Librarian is a free VST plugin designed to accompany Ichiro Toda's Synth1 Analog Synth VST instrument. It allows you to quickly find patches within your patch library – useful when you have over 17,000 patches.


  • Organises your patches into over 50 Categories
  • Uses heuristics to find similar sounding patches.
  • Lets you reorganise your Patches, however you want.
  • Random patch selection, to help find undiscovered sounds
  • Intelligently scans your entire zipbank folder for patches.
  • Automatically excludes duplicate libraries
  • Create your own Categories and Banks
  • Save custom patches from Synth1 directly into your own banks.
  • Apply colouring to any patch.
  • Patch parameters can be adjusted/automated from the host DAW.

Here's a video explaining what it is, and how it works (old alpha version):

{See video at top of page}

Latest User Reviews

Average user rating of 4.33 from 6 reviews

Synth1 Librarian
Reviewed By Jaidy
March 20th, 2021

If you have Synth 1, this is a must have.

Especially useful is when you find a patch you like, it will show you patches it thinks may sound similar which is great because so many people name patches with names that are misleading or non descriptive. The suggestions it gives are mostly spot on.

Only down side is it encourages you to collect more and more Synth 1 preset banks and then loading times become so long it looks like the program has stopped working when in reality it may take several minutes to finish loading all the preset banks.

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Synth1 Librarian
Reviewed By mlbellino
November 27th, 2020

I downloaded and installed the 64-bit version and used it in Reaper for 1 day. Really liked it. The second day it would crash reaper when I tried to use it. I uninstalled and re-installed and Reaper would not recognize it. I had it scan the folder with the dll and Reaper crashes. The program was really useful, and made synth 1 feel new again. I'll try the 32-bit version and see if that might no be buggy?

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Synth1 Librarian
Reviewed By DarseZ
September 15th, 2020

It's no small statement to Synth1's power that there are thousands of presets available in the wild, but there are so many that it's essentially impossible to navigate them all. Synth1 Librarian has done much to tame this powerful beast, and to bring those thousands of presets within useful reach.

On top of all this, the developer NeutrinoSky donates all proceeds from donations to the project to worthy causes. Download, use, and donate. There's no downside here. A great project to contribute to.

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Synth1 Librarian
Reviewed By G33zrj1m
December 27th, 2019

I've been using Synth1 Librarian for about a year, and it sure makes finding a patch for Synth1 a lot easier. When I first installed it, it worked perfectly. However, now it will not load at all and I can't figure out why.

I have a Win 10 pro machine, 8 core, 16 G RAM. I use Reaper as my DAW but also Cantabile 3 as a VST host. I had not changed anything on the computer, but Windows updates are notorious for messing up existing software. And I think that's what happened here. Also tried another computer... more on that later.

Here's what happens... when I run Reaper, it will find Synth1's dll fine and will run the plugin... but it will not show the librarian at all! It does, however, show Neutrino Sky in the developers list. There are no errors given or any reason.

What I've tried so far...

1. re-installed synth1 (downloaded it again from author's website... same version that I already had).

2. re-installed the librarian (I downloaded the newest version .exe).

3. put Synth1 in the SteinbergVstplugins folder, and ran the Librarian setup from there.

4. ran the init for synth1.

5. started Reaper... cleared and re-scanned the vst's.

6. Reaper shows Synth1, but NOT Synth1 Librarian.

Same as before (and I've tried both the 32 and 64-bit versions of Reaper... makes no difference) on my Window 10 Pro desktop machine.

However... I also have it on a laptop running a Win 10 update from Win 7. I seldom use this machine anymore because it's getting old and slow. But I still have Reaper on it and a lot of my free plugins, including Synth1 and Librarian. When I tried to use the Librarian on Reaper on this machine, it took about 3 - 4 minutes to load the Librarian, but it did finally load and I was able to select presets from it.

Sorry for that longwinded intro... but I'm wondering if anyone familiar with Win 10 Pro might have an idea what I could look for? I really don't think it's a problem with the librarian app... but another example of MicroSoft's updates messing up our computers (which they seem perfectly ok with!).

Thanks for any help.


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Synth1 Librarian
Reviewed By dune_rave
May 13th, 2018

This is a cool librarian software, in my experience on win10 64-bit with Reaper, it works well.

Synth1 was always the best freeware alternative for synth plugins, .

but I stopped using it years ago, just because i missed a great preset browser inside it.

Now with this librarian, Synth1 is in my plugin folder again.

In the past I also did some Synth1 trick (e.g created an Excel macro, to generate random patches for ten banks).

With this librarian, I'm able to find the right presets among thousands of presets.

For example I liked the distorted guitar sounds of ReFX Slayer (yeah, I could use it from FLStudio), .

and now I can click on "guitar" in this librarian, and easily find some brutal distorted guitar sounds among the Synth1 presets.

The other freeware synth I use is Dexed. also have a "limited" patch manager - I only wish there were some simlar librarian to that.

This is a super cool addition to the already legendary Synth1, and if you also like it, please consider a donation of your choice.

Read Review

Comments & Discussion for Neutrino Sky Synth1 Librarian

Discussion: Active
31 January 2018 at 2:45pm

Nice tool to use as complement to Synth1. Thank you.

1 February 2018 at 8:24am

Awesome!! Thank you so much, Now I can actually use this nice synth, overwhelming before to find a certain style of patches. Good job!!.

2 February 2018 at 5:15pm

"Here's a video explaining what it is, and how it works (old alpha version)"

Can't see a video?

2 February 2018 at 5:23pm


3 February 2018 at 11:34am

The installation of the net framework stops at about 5 procent and doesnt move. Tried both x86 and x64.


6 February 2018 at 8:19am

Seems this is a long standing Microsoft/Windows/.net framework problem (see here). Couple of ideas:


3 April 2018 at 6:13pm

This tool is amazing and much appreciated. A long time ago I downloaded more presets for this legendary synth than I could listen to in a lifetime. This makes exploring them fun and productive.


14 April 2018 at 3:38pm

Access to the path 'C:\Users\Pedro\AppData\Roaming\Daichi\Synth1\Synth1.ini' is denied.

I am having this error. Any ideas on how to fix it??

15 April 2018 at 10:02am

First we need to establish if Synth1 Librarian is the problem, or if there's a bigger issue. Try this:

1) Load up Synth1 VST in your DAW (not via the Librarian)
2) Click opt, and change the ExtBank folder to a temporary location (e.g. C:\)
3) Click OK
4) Close down your DAW completely, so that Synth1 VST is unloaded from memory
5) Now restart your DAW, and reload Synth1 VST
6) Click opt, and check the the ExtBank folder.

If the value isn't C:\, you've got some kind of Windows issue. Does your Windows user name contain accented characters? If so, that could cause problems.

15 April 2018 at 10:19am

Also, check the file properties for Synth1.ini, and ensure that read-only isn't checked.

15 April 2018 at 4:40pm

Yeah got it fixed. Problem with permissions.

13 May 2018 at 12:52am

With the advent of the Librarian, I use synth1 more often... especially with drone-e and hypercyclic.

13 May 2018 at 1:01am

Zebra could use this as well.. Would be nice.

18 May 2018 at 12:50pm

If anyone experienced problems getting Synth1 Librarian to work with their DAW/host (e.g. Cantabile), I've just released a version that hopefully fixes the issue.

21 July 2018 at 11:30am

Great tool!!.

Could you please take a look at high PPI friendliness?
It seems like it reports wrong windows size to a host.
I'm using 4K monitor, with ppi scaling set to 175%. When the plugin I run the plugin in Reaper in a native mode (without bridging), everything looks properly (fonts are scaled and sharp) but rendered window is horizontally too small. see screenshot

I've also tried to run the plugin in bridged mode. This time the entire window is displayed, but fonts suffer from the issue of non-high-ppi-ready-application, which renders by blurred fonts (those are rendered to bitmaps and upscaled by operating system. See screenshot

This issue might be however related to Reaper bridging implementation.

Link to both screenshots on one page.

Please note I intentionally left host window a bit bigger to show borders of plugin UI itself.

With regards.

25 July 2018 at 11:23am

Thanks for letting me know. I'll see what I can do (without having to re-write the UI;)).


4 August 2018 at 1:08pm

If you have accents or umlauts in your WIndows user name, I've posted a workaround to get Synth1 Librarian working with Synth1:


2 November 2018 at 8:37pm

How to load the librarian in synth1?

13 November 2018 at 7:07pm

The librarian doesn't work like that. You install it as a plugin, and then configure it to point to your existing Synth1 VST. You should find all the instructions to install and configure it on my website.

22 April 2019 at 7:29am

Just released a couple of fixes so that your DAW/host doesn't have to be run as Administrator.

11 December 2019 at 12:49am

Hey great job Mr Neutrino! I love Synth1, but patch management is awful and I've tended to drop it out of use - I've needed this app for a long time but didn't realise it existed. Have installed on my Win/10 64-bit machine and using Cantabile, running several instances in parallel without dramas. It is ridiculously easy now to find patches quickly, and "favourite" them for later; with multiple instances it's so cool now to find the right blend of sounds when I've got two or more keyboards running and in the middle of some creative activity, something that would normally frustrate me trying to scroll through the thousands of patches in all those ZIP files. Have made a small donation - please have a pint on me :).

31 August 2020 at 10:10am

I've just released an update, and you can find more about it here: https://neutrinosky.com/2020/08/31/synth1-librarian-2020-831-now-available-bug-fix-release/

Hope you're all keeping safe and sane, and had a chance to make lots of music during lock-down! Take care everyone.

19 November 2021 at 6:47pm

Hi Neutrino Sky, .

I have the problem, that Synth1 Librarian is not loading all zipped libraries I have in the zipbank-folder. I had a couple of libraries in unzipped format in my Synth1-folder, prior to installing Synth1 Librarian, so i zipped them myself and put them to the zip-bank folder. For that I used 7zip and specifically toke care to choose .zip format and only pack one folder with maximum 128 .sy1-files in each zip-archive. What am I missing?

If you need them, I could provide screenshots via DM. I tried the most recent build (just downloaded today), both in Reaper and Cakewalk, Win 10 64-bit.

24 November 2021 at 7:57pm

Is it possible, that it's actually eliminating duplicate libraries?

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