Olearia: a collection of applets for the Daisy Patch

carl · July 5, 2020, 4:28pm

Olearia

A collection of applets for the Daisy Patch.

Mode	Control	Audio In
VCA	Level	Signal
VCO	Pitch	–
Noise	Level	–
VCF	Cutoff	Signal

All outputs direct through the audio outs.

Switch mode using the encoder. Hold the encoder and turn to navigate between applets.

CODE: https://github.com/CarlColglazier/Olearia

DOWNLOAD: https://github.com/CarlColglazier/Olearia/releases

antisvin · July 5, 2020, 4:58pm

Very nice. Maybe something like that could be a part of DaisySP lib.

It looks like you don’t deallocate memory on applet switch, this should probably be fixed.

carl · July 5, 2020, 5:06pm

Yes, good catch! I just fixed this in the latest commit.

antisvin · July 5, 2020, 5:25pm

Unfortunately my device is in USPS limbo for the next month. But if this is heading where I think it is, Applet is begging to become a template class to be reusable with different generators.

carl · August 17, 2020, 2:38pm

Release 2020.08.17 is out here: Release WVSHPR · CarlColglazier/Olearia · GitHub

Now featuring a rudimentary waveshaper and FM VCO.

erwincoumans · August 17, 2020, 4:00pm

Thanks for sharing, will try it out. The Daisy Patch (and your demo) could use some nice shimmering reverb, perhaps the JCVerb (https://ccrma.stanford.edu/~jos/Reverb/A_Schroeder_Reverberator_called.html) or https://github.com/highfidelity/gverb ? Or are there any open source implementations available closer to Strymon Big Sky ‘clouds’ or Erbe Verb?

erwincoumans · August 18, 2020, 4:07pm

Found CloudSeed, which is the closest to Strymon Big Sky ‘Clouds’ I’ve found, and give the core is C++, it could be a nice candidate for a great Daisy reverb. https://github.com/ValdemarOrn/CloudSeed

carl · August 18, 2020, 7:27pm

Both a delay and reverb would be great additions. The documentation for JCVerb is quite a good starting point. I’ll need to learn a bit more about coding all-pass filters and comb filters.

This seems a good starting point: https://github.com/madronalabs/madronalib/blob/master/source/DSP/MLDSPFilters.h

erwincoumans · August 19, 2020, 2:44am

CloudSeed c++ source is easy to read and has the all pass filter as well:

github.com

ValdemarOrn/CloudSeed/blob/master/CloudSeed.Native/ModulatedAllpass.h

#ifndef MODULATEDALLPASS
#define MODULATEDALLPASS

#include "ModulatedAllpass.h"
#include "FastSin.h"
#include "Utils.h"

namespace CloudSeed
{
	class ModulatedAllpass
	{
	public:
		const int DelayBufferSamples = 19200; // 100ms at 192Khz
		static const int ModulationUpdateRate = 8;

	private:
		double* delayBuffer;
		double* output;
		int bufferSize;
		int index;

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carl · August 19, 2020, 11:51pm

I had a go at a Schroeder Reverb as described in Physical Audio Signal Processing (Figure 3.7): https://github.com/CarlColglazier/Olearia/blob/39fe438e8a5a8082daeff95f41049f07d23f81eb/src/Applet.hpp#L64

Manysounds · September 2, 2020, 5:36pm

On our way to an O_c / Disting like environment !!

antisvin · September 2, 2020, 5:40pm

It’s not a real Disting if you can understand how to use it without a manual!

kuhoyip · October 8, 2020, 9:52am

If you can add a LFO into your app list, it would be perfect!