diy synth / modular

Documentation of building a polyphonic MIDI synth & generative sequencer using the STM32F401 & STM32F746 discovery boards. If you want to build your own synth, sign up for a workshop @ http://workshop.thi.ng 

stm32f4/f7

This recording is available to download from: http://boilerroom.tv/recording/erika/


Want audio? Check out our free mobile app! 

Boiler Room x Moogfest w/ Teengirl Fantasy, Erika & Survive.

[Broadcasted 24th April 2014]

Tracklist & video at boilerroom.tv

Erika Boiler Room x Moogfest Live Show

Added some features to generative semi-random sequencer (Mersenne-Twister Tiny), now with key changes on predefined secondary scale. Also switched to mono delay to achieve longer periods (due to RAM limitations)

stm32f401 - 4-polysynth + additive/saw + monodelay

New oscillator type: square wave w/ LFO controlled duty cycle modulation for complete electro madness... (LFO: sine @ 110Hz, duty cycle between 5% - 95%)

stm32f401 - 4-polysynth + square mod

added new global LFO to control stereo positioning of synth voices and their 2 oscillators, also doubled delay period (due to previous brain fart...)

stm32f401 - 4-polysynth + additive/saw + autopan + delay

Experimental spiral oscillator (x 2, slightly detuned) + fixed LPF @ 11.8kHz. Oscillator takes y-value of 2d spiral equation to produce waveform (with PolyBLEP to smooth). No filter modulation. LFO is only used to modulate number of spiral turns/twists (0.5 - 3.5)

sin(lfo * phase) * phase / TWO_PI

stm32f7 - synth - spiral

Some dirty easter beats made w/ Ableton + fat bassline and other synths brought in (sampled) from STM32F7, courtesy of http://thi.ng/synstack

20160325 sketch (STM32F746 + Ableton)

Best enjoyed with headphones! Recorded live set in hotel after last minute tech issues during my lecture. Turned out the Korg nanoKontrol lost its configuration earlier - such a shame, was looking forward to hear it on big speakers! :)

Synth is running on a £35 STM32F746-DISCO board and also implements a 2-track 8-step sequencer w/ interactive controls for osc waveform, filter, env, delay, LFO and global transpose all via Korg nanoKontrol... Activated notes are randomly picked from a fixed scale (only once, not random at every invocation)

STM32F7 live recording (Resonate)

http://thi.ng/synstack demo running on ARM Cortex-M7 / STM32F746-DISCO, full source code http://github.com/thi-ng/ws-ldn-12 (ex07)

stm32f7 - synstack - 3 osc + fb + sdramdelay (WS-LDN-12)

Another workshop example (ex06), more info here: http://thi.ng/ws-ldn-12

stm32f401 - 4-polysynth + square mod

forthcharlie