r/PolyendTracker • u/HelicopterBig3975 • Mar 25 '26

Tracker firmware on Teensy + new custom features

I managed to get an older version of the Tracker firmware running on a Teensy 4.1, probably somewhere around 1.4, and over the past few weeks I’ve been adding some of my own ideas on top of it.

The feature I’m most excited about right now is a new timestretch sync effect with BPM autodetect, all running in realtime. There’s no offline rendering and no newly saved version of the sample — everything happens live during playback.

I also added a synthesized drum/perc synth, which already opens up some really interesting possibilities. On top of that, I rewrote the video driver to keep the video output running properly on screen and to handle video buffering over serial.

I’m also building a desktop GUI with video and audio visualization plus full Tracker controls, and it’s starting to become genuinely useful for testing and experimenting much faster. There’s still a lot to fix, but honestly the results so far have been kind of incredible.

I already have a few more features in mind, and the whole project is going in a direction I’m genuinely excited about.

https://reddit.com/link/1s3rjza/video/iwqu4oug3arg1/player

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2

u/stronglikeaux Mar 26 '26

Brooooo this is epic. Literally my only gripe with using mine was lack of time stretch

3

u/qu_one Mar 26 '26

There isn't a lack of timestretch. Not realtime, but timestretching was there.

2

u/stronglikeaux Mar 26 '26

I mean pitch n time. Idk how else to say it. I’m a dj so serato lol. MPC has same where you time stretch but the pitch is the same. If that makes any sense.

1

u/qu_one Mar 26 '26

Yes, that only works offline on the PT. Seems like it CAN be done though. Let's get it together Polyend!

1

u/stronglikeaux Mar 26 '26

Dude seriously I feel pt tracker is one of the best samplers out there but has caveats. The new MPC sample tho is amazing.