The Beatsqueezer (STM32F4 sampler) #MusicMonday

Thanks to Ilya for sharing this project with us! Check out more info here.

Hello. My Name is Ilya Pikin, and this is a page about my sampler-player device, which I am working on.

It is based on STM32F407 168MHz microcontroller, CS4334 audio DAC, AD8532 amplifier, Samsung K9FxG NAND flash memory, which allows to store up to 1GByte of CD quality (44100 Hz 16 bit) mono samples.

The Beatsqueezer produce Hi-Fi sound in 44100 Hz 16 bit stereo and up to 16 sounds polyphony. So you can create you own great sounding Mellotron-style synthesizer, drum mashine, add some sound effects, play with sample loops e.t.c.

It has 4 knobs, 1 rotary encoder with button, 16×2 character display, DIN5 MDI in, 3.5 jack audio output, micro SD card slot and mini USB for device powering and communication with computer thru USB-MIDI.
Intuitive and simple navigation in menu, using only one rotary encoder.

There is a possibility to upgrade or install different firmware from SD card thru built in bootloader.
For onboard knobs implemented the “smart knobs” behaviour – filter value will changing, only if real knob position and value will match.

With special software, user has possibility to create his 100% own sample banks. The file format supports 128 audio samples, one sample for each note. Sample looping point, for infinitive playback. Cut group, for playing only one sample at one time from specific group (for example: open and close hat, solo instrument), or multiple samples (for group 0). Dynamic or fixed velocity for each sample. “Ignore note off” (for example: drum sounds) or “Stop after note off” behaviour. If “Ignore note off” feature and loop point are defined, sample goes to “Live looping” mode, when 1-st press will play sample and 2-nd will stop it. Stereo panorama for each note.

Also Beatsqueezer has range of filters and special effects: low pass resonant filter, ring modulation, flanger, stereo rotary vibrato, limiter, bitcrusher, granular glitch, delay with low pass and high pass filters, ADSR envelope for amplitude and ADSR for low pass filter.

Read more.

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