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Triangle I

Synth (Analogue / Subtractive) Plugin by rgc:audio
Newer Version:
Triangle II
Triangle I has been replaced by: Triangle II
Triangle I
Triangle I by rgc:audio is a Virtual Instrument Audio Plugin for Windows. It functions as a VST Plugin.
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Overall: 2795   2679

30-Day: 1945; 7-Day: 1893; Yesterday: 1407


  • 2 Oscillators with multiple waveforms.
  • Pitch, Filter and Amp envelope generators with velocity, scaling and amplitude controls.
  • 3 LFOs.
  • Portamento.
  • Multi-mode filter with resonance.
  • Noise generator.
  • Oscillators, filter and amplifier controllable by Aftertouch, mod wheel and velocity.
  • Stereo spread.
  • Echo.
  • Extensive MIDI implementation: Portamento on/off, time, volume, Aftertouch, sustain switch, modulation, pitchbend, breath, velocity, cutoff, resonance, detune, transpose, osc1wave, osc2wave, delay level and a lot more.
  • Three keying modes: Fingered, High note priority legato, Full legato.
  • Many features can be disabled to save CPU.
  • Outstanding look with wooden surround by Matthys L.C. van Amsterdam (Alterex).

Latest User Reviews

Average user rating of 4.38 from 13 reviews

Triangle I
Reviewed By CoreTrooper
October 21st, 2003

I remember back more than a year ago I downloaded T1 and T2, and at the time I was still learning alot. After a few tweaks and so much a novice at synthesis could do with not much of second thought I kept Triangle 2 as it had the sound I wanted and triange 1 was deleted from my machine.

About 3 month ago I noticed people talking about the original and how it has a unique sound, I thought to myself was I misssing something it wasn't that incredible to me a year before...so I go and pick it up and start playing with it...after a few day of having it on my machine I have over 50 patches for the synth all incredibly usefull and 95% are various basses.

Ok The synth can be confusing for newbies trying synthesis and programming (as you read above I can vouch for that) but this thing is a very fast synth that will get the sound you will want to keep in a short time. The filter on this baby can scream at higher resonance (though tb303 is possible with this synth the filter does distort at high frequencies so the squelch is not there but for 303 stabs it rocks)but when having certain sounds at a low frequency, clicks appear that will not go away with any adsr work but raising the cutoff will rid the clicks but the sound is no longer what you need (IE Bass)but most of the time will be hidden by the percussion in your music anyway so its not the biggest deal.

the Oscillators still confuse me as it doesn't say what wavform your using but its not a problem if you use your ear. the sound is phatt and raw but can get digital sounding easily...many sounds can be made from this synth from 303's to evolving pads, to screaming leads and a whole lot more even nice organ sounds and various percussion.

the lfo's and eternal fx are very usefull espeically for pads and strings, the delay is a nice touch for adding a delay without to much cpu being drained. The synth even has a noise generator for addding dirt to your basses or to make percussion and wind noises.

This synth is perfect for low subby basses, housy basses, and For dirty german hardhouse basslines that we all love :)This is not a one trick pony as I have heard people say,its a power synth in my arsenal going head to head with T2 and iblit as my favorite free analog style softsynths, 2 thumbs up to Rene for creating this weapon.
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Triangle I
Reviewed By kritikon
June 10th, 2002

Initially I wasn't overly impressed with Triangle, but it's grown on me. I liked the smoothness of the sound straight away, but felt it wasn't too versatile. But after using a few times, I've had a good range of sounds from it. It has a very musical filter (in that it will still sound good when self-oscillated) which is not too common in VSTis. I find it good for mid range sounds, and good in the higher range too. What lets it down is the bass response of the filter - it seems to be common in VSTis that it's hard to get filters to work in the bass range. Sure Triangle will give nice rounded warm basses, but it won't resonate usefully down low - it's good for warm bass, but not if you want to do spikey bass with fast decay/attack times.

But I'm being picky really - only classic synths such as 202 or SCI Pro-One have really fast decay portions to the envelope - even Junos etc are a tad slow on that front, and old Korgs are even slower. But Triangle holds up against most common analogue hardware.

In fact, I mainly like it for some of the more delicate sounds - it's not a power house, but careful programming will give some rich filter sounds when you modulate to get movement going in the mids. It doesn't sound anything like a Korg MS series synth, but it reminds me of the type of hollow haunting sounds you can get with those. Which is praise for Triangle - you CAN compare it with analogue synths (unlike alot of VSTis).

The layout is good - obvious and logical with no frills to brighten it up too much.

Not too hard on the CPU, and rock-solid reliable.

The FX are a good addition to the sound - nice chorus and decimator. They complement the patches rather than overpower them.

I don't use it in everything by any means, but it's a good workhorse for those general-duty sounds and some occasional flourishes. Not an in-yer-face character synth, but good quality at what it does.

Quality is the main theme - won't set you on fire, but you can rely on it.
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Triangle I
Reviewed By Funkybot
March 7th, 2002

I've had this freebie on my hard drive since I first heard about it, and I gotta admit I didn't start giving it much useage until I tried the Pentagon demo, at which point I thought hold on there might be something to that Triangle thing. Well it wasn't quite that drastic, but it certainly was underused. Well since then I've wisened up and gone back to Triangle and I gotta say at times I find Triangle more useful than Pentagon. It's just easier to deal with than Pentagon at times, due to the less knobs, plus having limitations is nice. If I need a nice lead that I know will be a monophonic melodic line I'm going to open up Triangle before P1, sure P1 has a great mono mode but Triangle is a lot more user friendly for quick leads, and even bass lines (the one time I wrote a tune with a synth bass it was provided by Triangle). Just concider this thing to be a super moog of sorts, it can create those classic Moog leads and bass sounds, but do soo much more. As far as the GUI goes I like it, it's friendly on the eyes, a good size, and I dig the color scheme and overall design. All and all this is too good to be a freebie, don't overlook it.
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Triangle I
Reviewed By Tronam
March 6th, 2002

It's free and a product by rgcAudio, so you might as well stop reading this and just download it. René's instruments are always musical and of high quality. This is certainly no exception. You could look at it as the little brother of the polyphonic Square I, another of his highly regarded older generation virtual analog synths.

Being a monosynth, some of the most common uses for Triangle is bass and lead sounds, which it handles well. The filter on this little guy has a very warm, musical quality to it that is kind of rare in the virtual world. Though I'm sure it is capable of aggressive sounds, it definitely seems to lean towards sweeter, gentler timbres. The newer engine instruments such as Triangle II and Pentagon I seem better suited for more powerful, edgy, aggressive sounds.

With 3 oscillators, 4 LFOs, built-in effects, more advanced control features like aftertouch sensitivity and various other features, it is surprisingly flexible for a freeware instrument.

Bottom line: It has a unique sound, lovely little musical filter and is free. Definitely a worthwhile download.
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Triangle I
Reviewed By
March 6th, 2002

Pentagon's little brother may have stopped growing (for the time being?) but it's sure not retarded!

Triangle I is a perfect FREE entry into the world of analog synthesis. Make no mistake, it cannot compete with Pentagon or Cronox, but I have never come across a single free analog softsynth (and I have all of them, trust me:) that offered more features, a more beautiful, lush sound, or a more logical interface. In fact, it seems like most people (including myself) keep using it even *after* they bought PI, which alone is a testament to the rich - and unique - quality of its sound.

Personally, I am not in love with its look, but it looks like René just might update its GUI to that of Pentagon. Its only serious limitation is that it's monophonic, but nothing stops you from using several of them simultaneously. In all, Triangle I is complex and control-rich enough to give you a fascinating opportunity to learn analog sound creation, but simple enough so that you don't get overwhelmed by all the knobs and buttons (of which, BTW, there are 55 - more than the Roland JP8080 has...)

Many people mentioned the lack of documentation. FALSE! THERE IS A COMPREHENSIVE MANUAL AVAILABLE IN HTML, and while I don't know how you can access it from rgcAudio's website (it seems like René is so busy making his superb products even better, he tends to forget about the website...:) if you send him an e-mail he will provide you with the link.

Summary: if you don't download it and give it a try, you are a fool - and I do stand by that statement.
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Comments & Discussion for rgc:audio Triangle I

Discussion: Active
1 October 2013 at 7:35pm

Who said Triangle is no longer available !?!?

Triangle in its second version (Triangle II) is freely downloadable directly on the website of Cakewalk .


15 February 2014 at 8:11pm

...but Triangle I is a bit of a different animal... I'm glad I have it and I wish rgc:audio wuz still doin' it to the vsti and mini-host world. Does anyone know if they're developing under a new handle??

15 February 2014 at 10:54pm

No. All this series (Triangle, Square, and even Pentagone) is being totally abandoned for years and years.

Like you I have all the versions of all these wonderful synths, and yes they were a bit different in their results from versions to version... But apart very few exceptions I always use the last version of these old excellent synths created by René G. Ceballos (rgcaudio, rgc was the three initials of his name).

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