# PreRoll midi effect

**URL:** <https://squarp.community/t/preroll-midi-effect/16085>\
**Category:** General discussion\
**Created:** [March 24, 2026, 3:02am UTC](https://squarp.community/t/preroll-midi-effect/16085 "2026-03-24T03:02:56Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![da23real](https://squarp.community/letter_avatar_proxy/v4/letter/d/e274bd/32.png) [@da23real](https://squarp.community/u/da23real)\
**Post date:** [March 24, 2026, 3:02am UTC](https://squarp.community/t/preroll-midi-effect/16085/1 "2026-03-24T03:02:56Z")

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Here’s a video in wich I show some Teensy DIY project done with IA and mostly a **PreRoll midi effect**.  
Wich is similar to a roll except notes are **generated before the selected** ones  
The machine is basically a multicanal remixer, to copy, move steps etc… not for a single track but the whole pattern.  
Unfortunatly unstable above 100bpm actually. I don’t know if it’s GPT unable to code a good midi sequencer or Teensy CPU limitation

I will put the full code with the full lenght video so if Squarp can put it in Hapax that would be cool  
I will probably do english, italian and german versions. Each one with different exemple track (I did italian today but at 140bpm totally unusable)

[![](https://img.youtube.com/vi/zp4i3wH8MDA/maxresdefault.jpg "Nouvel Effet Pré-Roll") ](https://www.youtube.com/watch?v=zp4i3wH8MDA)

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**Author:** ![system](https://squarp.community/user_avatar/squarp.community/system/32/2_2.png) [@system](https://squarp.community/u/system)\
**Post date:** [April 14, 2026, 3:03am UTC](https://squarp.community/t/preroll-midi-effect/16085/2 "2026-04-14T03:03:28Z")

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