[sdiy] TeensyLooper

[H.Sergio Alves]

Thanks for your words Benjamin!

I’ve now added reverb to the project using the free verb library and
controls for room size and mix, also added a sample start and end point
adjustment using encoders. I’ll update the GitHub soon  :-)

On Thu, 29 Jan 2026 at 13:05, Benjamin Tremblay <btremblay at me.com> wrote:

> Some kind of heart emoji is in order.
>
> I tend to overbuild my Teensy projects until they do way too many things.
> This is using all the Teensy (and chatgpt) goodness to do one thing well.
>
> And yet, it seems there’s one thing that could be added, perhaps some
> granular controls. Most basic would be to move a single start/end of sample
> around at same or variable loop length.
> It gets “granular” when the controls have coarse/fine modes.  With great
> restraint we can forego an OLED waveform display.
> But then, shucks, you need at least one ADSR envelope, preferably 2 so you
> can move the grains (any or all points) differently than the amplitude with
> the envelope.
>
> Yeah, this is why you should never let me get involved with design… It
> snowballs. Menu diving gets into everything.
> The simplicity of this project is beautiful.
>
> Benjamin
>
> On Jan 29, 2026, at 7:09 AM, Heitor Alves via Synth-diy <
> synth-diy at synth-diy.org> wrote:
>
> Hi All
>
> https://github.com/HeitorAL9000/TeensyLooper
>
> TeensyLooper
> An audio looper with reverse capabilities and low latency, reverb and
> based on the Teensy (4 and 4.1) platform.
>
> This project is born out of the "need" for a simple audio reverse tool for
> my live setup. It will be connected to the AUX1 send/return bus on my
> console but the main use will be to record and reverse spoken words from
> old vinyl records. A unit that samples a few seconds of audio (mono) and
> reverses it playing it in loop mode.
>
> The base is a Teensy 4.0 and it has a 4 second sampling time @ 44.1khz
> sampling rate 16 bit resolution. You can use a Teensy 4.1 that will
> increase the sampling time to 8 seconds.
>
> First interaction:
>
> one input one output Rec button Kill button Loop or single shot switch
> Reverse or forward switch
>
> Code for 4 seconds To Do:
>
> PCB
> Front Panel
> test reverb FX Code
> Test add ons (second interaction)
> Second interaction:
>
> Added GATE/TRIGGER control for record and kill function Added Reverb FX
> (via code and Open Source Library) Added Reverb Size potentiometer Added
> Reverb WET/DRY potentiometer
>
> Feel free to try it, hack it, change it. Any suggestions are welcomed and
> if you find bugs or improvements let me know :)
>
> I'm no serious coder so i admit i used chatgpt for the coding part.
> Hardware wise it's pretty straightforward :)
>
> Thanks for taking time reading this
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