TetraOP

Hi, i've found a possible bug, when Velocity is modulating an envelope value (Attack decay, ...) the velocity modifies the values of notes sounding in the background. I expect that velocity modifies ONLY the notes played before note off, leaving background notes untouched.
Other than that, this is a wild feature instrument. It needs a wider set of patches to demonstrate what's capable to users that don't dare digging into it.
Thanks & good luck on this KVR DC.

Thanks and I'll have a look.

How do you install this? I guess im so used to PKG files that im not sure where to place these files and folders at.

Thanks for any info.

Hi Tilr,
a few months ago we had a nice chat here "fixing" and enhancing your marvelous delay plugin, which was and is my absolute go-to two tap delay from then on. Maybe you remember. :)
To make it short - to me you have a winner here with TetraOP. It sounds very good. Hope you win the DC - you'd imho deserve it.

However, here's a few points you might consider implementing (i might find a bit more - i'm just playing around with this gem since an hour):

• for the two filters it would be extremely nice to have their own polyphonic vca's and panning - both with knobs (or at least numeric fields). The reason for that is quite simple - one could use one osc with one filter do one sound (say, a pad) and with another osc with the second filter one could do a completely different sound (say, some ambient fx blubber or such, being modulated with a mod env and/or an LFO) to be layered with the pad i did with osc 1 and filter 1. And the polyphonic panning after the filter is necessary, as with self oscillation (max reso) one can't really pan the oscs, as the self oscillating resonance stays centered no matter what. If you can't put these options on the gui, you could maybe make these parameters available in the matrix dropdown. The main point here is, that one can modulate the filters vca amps and panning via the matrix with polyphonic and/or monophonic sources. This would really go a long way - especially for me being a sound designer for my living. Opens a whole new realm of possible sounds.
• could you maybe allow for polyphonic glide?
• make the self fm parameter for the individual osc's modulatable.
• for the main amp a global polyphonic panning knob, that one can modulate via the matrix.
• a polyphonic "alternate" parameter in the mod matrix as source, which with every note on alters between -1 and 1 - the mod depth determines the amount.
• give the mix parameter in the phaser in the fx section a button so that is actually able to output exclusively the wet signal (so the mix knob then is fully wet, when it is fully right). Because it can then additionally to the traditional phasing serve as a great static phase rotator/phase disperser. This does wonders on percussive material such as any drums or basses.
• give the reverb a modulation in the feedback structure, which modulates the delays feeding the feedback matrix. If done right, this does wonders to hars, unpitched input signals and can create very cloudy reverbs. Because it one feeds a static signal into a reverb without modulation for longer as the feedback matrix has seteled itself, all that's left is a signal being heavily comb filtered. In short - a modulation of the delays within the feedback path does wonders, if done right. So essentially one neds 2 parameters for that: Modulation speed and modulation depth. If done right, a sine as modulation source with min 0.01hz to max 6 hz should work just fine.

and finally something that seems like a bug:

• when in mono mode (both with or without legato), the voice seems not to react to velocity until it is fully switched off. In other words, the amp env has to run through to is very end, then the voice shuts down - only then the nev velocity value is accepted. Or even differently spoken: When triggering the new voice with the new velocity value within the previous voice still being active, the velocity has no effect.

I would loooove to see these above points to be addressed. But of course it's you who decides.
Other than that i can only repeat myself - TetraOP out of so many freeware that pops up (mostly vibe coded/AI coded) to me is a wonderful surprise. And as far as i can say after the short time playing with it, TetraOP imho can easily rival commercial products. So big thanks for that one.

Possible bug:

when the filter is modulated by an envelope (both amp and filter env having a hard attack and the filter env ramps down to 0 sustain with a decay of in my case 263ms) and the env that modulates the filter cutoff is modulated by velocity in its amount, there seems to be a small lag between the velocity values. You can verify this by playing a note with the value of 127, then following a note with the value 1. It will have a glitch.

Heres a quick preset that will show you, if you do follow the above description:
https://www.dropbox.com/scl/fi/oh48dzxcupav54o1v3xyu/TetraOP-Velocity-Glitch.xml.zip?rlkey=ivlsiyvpwklqs82sjiv696ugv&dl=0
Please let me know if you were able to download it successfully so i can delete it from my dropbox.

Some additional thoughts you might want to consider:

• the global amp as well as the global pitch are monophonic. But quite often it is necessary to correct the overall level (and also the global pitch) via a polyphonic source.
• just like in your Q-delay plugin, the ping pong delay in TetraOP has the feedback after one tap. Which, like in Q-delay has the problem that there is an over-pronouncement to one side constantly, if one sends a constant signal (like f.e. a pad) into it.
• just like in Q-delay the input of the wet portion in pingpong mode in TetraOP is only stereo. So just as in Q-delay in your first ping pong mode the delay discards the input of the left side. Which is bad, if the input is panned to the right side, as then the delay is nonexistent for that signal. So you might consider (like in Q-delay) another ping pong mode in the dropdown where the feedback is after the second tap and the input into the wet path is summed up to mono. :).

Found a bug: Delay time in Hz not saved in host. Upon closing and re-opening the project the delay time was instead set to 250 ms rather than whatever I set it to before saving. Tested in FL Studio 20, 2024 and 2025 on Windows 10. I like this plugin a lot so I hope this can be fixed.