Raspberry Pi – Synth Collection final test

December 6, 2015 · Posted in Uncategorized · Comments Off on Raspberry Pi – Synth Collection final test 

A very quick test of two USB MIDI keys into a Raspberry Pi Model A (emulating a Pi Zero, overclocked to 1GHz) via a powered USB hub.

The 1GHz configuration leaves massive amounts of CPU and memory bandwidth headroom, even with 8 synths running.

Using Raspberry Pi GPIO in SunVox

November 12, 2014 · Posted in Uncategorized · Comments Off on Using Raspberry Pi GPIO in SunVox 

Demonstration of the new SunVox module – GPIO. With this module you can send or receive the signals to/from GPIO pins of the Raspberry Pi.
SunVox v1.8 BETA2: http://www.warmplace.ru/forum/viewtop…

Human League’s Being Boiled on a Raspberry Pi

August 20, 2014 · Posted in Uncategorized · Comments Off on Human League’s Being Boiled on a Raspberry Pi 

Pi Synth continues to explore the Raspberry Pi

Fresh from the triumphs of Popcorn – the first Moog I ever heard as a 12 year old kiddie in 1972 – comes this, the first cool band in my lifetime to come from my home town, and still one of my all time synth classic tracks. So classic in fact that my sign-off test for this PIANA synth being done and dusted as a multi-part synthesizer was “it shall be capable of a halfway decent rendition of Being Boiled”. This is approaching a halfway decent version.

5 synths in total, which are –

Rattly snare thing – 2 note polyphony, it’s Fat Phil Collins with less echo, and it’s as close in spirit to the original Ian Marsh rhythm track as I could manage.

Kick – Fat Phil needed more bottom as he is bandpass filtered, so his bum gets removed. So he’s augmented by this monophonic resonant filter bass enhancer thing – sort of an 808 kick, it is just a resonant filter playing low notes.


Rezzy bass – a rezzy bass, with an actual 4th order filter on it

Reedy thing – a reedy thing, as seen yesterday on Popcorn

So, I still have 2 more synths of headroom on the Pi and already this is sounding pretty great. Amazing to know that the old Human League could gig for about a £50 equipment investment nowadays.

Yes, it’s not finished. Who cares. Just sit back and listen to the voice of Buddha, played on only 2 pitched synths and a bunch of percussive noises.

POPCORN – on a Pi

August 19, 2014 · Posted in Uncategorized · Comments Off on POPCORN – on a Pi 

 s version of the  synth pop classic, Popcorn, created on a Raspberry Pi – the $35 credit-card sized education computer. 

May I present to you, one Raspberry Pi Model B, one $5 USB MIDI interface, one £20(ish) Behringer USB audio interface, 7 Virtual Analog synthesizers, 9 notes of polyphony, a bunch (4 or 5?) stereo delays, a global reverb straight out of the upcoming Jordantron, and ladies and gentlemen – Popcorn!

Recorded straight out of the phono outputs of the Behringer into my Mac, no processing, exactly the bytes emitted by the Pi.

Raspberry Pi: Brian Eno’s Fat Lady – cheap computation model

June 19, 2014 · Posted in Uncategorized · Comments Off on Raspberry Pi: Brian Eno’s Fat Lady – cheap computation model 

Here’s an updated version of Eno’s favourite chubby girl, but rendered with a slimline synthesis model. All in an attempt to get this runnable on a single Raspberry Pi. This uses the non-oversampled synth, so everything is computed at 44.1kHz. It’s using the newer variant of the BPCVO model, in particular the revised bandlimiting code to attack aliasing hard at source, and I’ve redone all the synth presets to remove the filter on everything pitched to eliminate that particular computation burden. There are tricks you can play to bring back a ‘filtery’ sound in the absence of a filter – for example, morphing from sin to saw or sin to square sounds like a filter opening up as harmonics get introduced, and that trick has been exploited to turn the pair of “Brass” into pure 1980s digital filter-free synthesis. But despite the trick (early ramp via EG to morph from sin to saw, giving a harmonic enrichening over the first 100ms or so of the sound) you simply can’t replace a filter with tricks, so the sounds do suffer as a result. But hey, no free lunches here, the goal was to make it burn less CPU and still get a decent sound, so I’m thankful it sounds as good as it does. The “Fat Lady” bass has also gone filterless – with a reduction in its Phase Distortion and a more sin-like wave shape to de-fizz in the absence of actual filtering. Ditto the Warm Jets ‘guitar’, which actually prefers being filterless as it likes to sizzle, ditto Phil’s Wiggly Manzanera which still needs work. The percussive elements remain filtered because they just have to be, they totally rely on the spectral shaping and in most cases the self-oscillating resonance of the filter to generate anything at all apart from ugly noise.

And the result is, after most of the the filter removal and all the new performance tuning, this version runs in exactly 24% of an iPad 2. Only 24% – it may actually run on a Pi in this form. Think about that for just a second – there is a damn good chance that £20 of woefully underpowered educational computer will be able to synthesize this piece in real time, without resorting to a Pocket Orchestra. Bear in mind, ‘this’ is now 14 notes of polyphony, many stereo delays (seven? eight??), a global reverb and 10 separate synths. And I repeat, no samples – every single waveform is computed, constructed by segments of quadratics and cubics, and the waves are being wiggled by the mod matrix, by the 4 LFOs and 4 EGs. My God it’s full of code.

Audio was captured from the iPad and not processed in any way, these are exactly the bytes that I computed. Cool, eh? Plus, big bonus, you get the Eerie Noise – which is actually a combination of a dedicated ‘Eerie Noise’ synth and the pair of brasses, turned way down and pitch bent to buggery. Yay!

Next step – get this codebase rebuilt on a Pi and actually run it.

PIANA – Bristol Raspberry Pi Jam presentation

October 26, 2012 · Posted in Uncategorized · Comments Off on PIANA – Bristol Raspberry Pi Jam presentation 

A quick talk-through of the slides the Pi Synth guys presented to the 2nd Bristol Raspberry Jam a week ago. Demo to follow once all recompile and plug all the kit back in!

Associated blog post – http://raspberrypisynthesizer.blogspot.co.uk/2012/10/video-bristol-raspberry-…

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