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[sdiy] TeensyLooper

2026-01-29 by Heitor Alves

Hi All


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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