#SynStack

Karsten Schmidttoxi@mastodon.thi.ng
2026-01-26

10 years and a few days ago, I was running a DIY Synth workshop with STM32F7 dev boards in our kitchen in North London... Still have ~10 of these boards.

Here are also two videos (live performances) of some softsynths (some with MIDI via USB support) which we built in these workshops (I did quite a few of those in that year)...

STM32F746 MIDI synth (live recording, 2016-01-31)
makertube.net/w/6tYcSLrJdPfev8

STM32F746 synth (live recording, 2016-01-28)
makertube.net/w/mbeSF3y2rs2xnx

Some related project & workshop repos:
thi.ng/synstack
thi.ng/ws-ldn-4
thi.ng/ws-ldn-12

#DIYSynth #Synth #SynStack #STM32 #Embedded #Workshop #MIDI #Music4Coding

Screenshot of an old tweet from 23/1/2016 incl. a photo with a top-down view of a large kitchen table with 7x laptops, 7x STM32 dev boards (w/ LCD screen), some headphones, cookies, almonds, wine glasses and tea cups...

The tweet reads: "1st day of ARM #STM32F7 hacking workshop over, good times & lovely crew! Tomorrow audio! cc @ST_World @ARMEmbedded"
Karsten Schmidttoxi@mastodon.thi.ng
2025-10-25

Another track/demo made with Forth and thi.ng/synstack (see previous toot), at least partially, i.e. everything but the drums... Improvised live via MIDI (Korg Nanocontrol), then sampled and arranged in Ableton...

soundcloud.com/forthcharlie/20

#Looptober #Forth #Ableton #STM32 #Synstack

Karsten Schmidttoxi@mastodon.thi.ng
2025-10-25

Just discovering #looptober and wanted to share this old Forth experiment (from already 9-10 years ago 😱) with my thi.ng/synstack VM and its DSP/Synth vocab, all running on STM32 dev boards. This Forth-based stack VM and also its earlier non-Forth, DSP graph-based version in the same repo are all portable C11 code, independent from any audio drivers/libs.

The first example an extended version of the second. The entire Forth source for the 2nd example is shown in the attached image. It includes the note/scale selection/definition, code to create a synth with 2x oscillators and 2x LFOs, ADSR, foldback distortion and the probabilistic sequencer.

soundcloud.com/forthcharlie/sy

soundcloud.com/forthcharlie/sy

More info about the project here:
hackaday.io/project/9374-stm32

Playlist of 40 other demos (more varied & interesting than the above two examples. Will share & talk about some more of them in due course... ;)

soundcloud.com/forthcharlie/se

#Forth #Audio #Synth #DSP #STM32 #Synstack

Forth source code (using domain specific synth vocab) for the 2nd linked audio example. Text version is here:

https://github.com/thi-ng/synstack/blob/master/examples_vm/bass-seq.fs

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