Audio Module "clip" signal before sending to the DAW?

Nowhk · June 10, 2022, 11:46am

Its what I’ve written Not sure which part is unclear…

Sort of. You can easily manage audio at any voltage in Rack. As I said, nobody care, and rarely I see modules that hardclip signal.

Ahornberg · June 10, 2022, 1:27pm

You could write your own audio module based on the core audio module. Just copy the module to your own plugin and remove the lines 128 to 134 and it should work fine (in theory).

github.com

VCVRack/Rack/blob/v2/src/core/Audio.cpp

#include <mutex>
#include <chrono>
#include <thread>
#include <condition_variable>

#include "plugin.hpp"
#include <audio.hpp>
#include <context.hpp>


namespace rack {
namespace core {


template <int NUM_AUDIO_INPUTS, int NUM_AUDIO_OUTPUTS>
struct AudioPort : audio::Port {
	Module* module;

	dsp::DoubleRingBuffer<dsp::Frame<NUM_AUDIO_INPUTS>, 32768> engineInputBuffer;
	dsp::DoubleRingBuffer<dsp::Frame<NUM_AUDIO_OUTPUTS>, 32768> engineOutputBuffer;

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Btw. I made my own MIDI input module for better handling specialized MIDI controllers.

Nowhk · June 10, 2022, 1:37pm

Yes in fact I’m just doing this

DaveVenom · June 10, 2022, 3:53pm

Has anyone checked to see if Stoermelder’s AudioInterface64 simply is the same as VCV audio interface except extending the channel count, or if there are other changes? I haven’t looked at the code. I can’t find any documentation on it.

Ahornberg · June 11, 2022, 5:12am

One is based on the other and changes are mosty in the GUI.

Ahornberg · June 11, 2022, 5:32am

I made a quick change in AudioInterface64 by @stoermelder and got what you want.

I simply removed the clamp() in line 61 in AudioInterface64.cpp

github.com

stoermelder/vcvrack-packone/blob/v1/src/AudioInterface64.cpp

#include "plugin.hpp"
#include <audio.hpp>
#include <app.hpp>
#include <mutex>
#include <chrono>
#include <mutex>
#include <condition_variable>

namespace StoermelderPackOne {
namespace AudioInterface64 {

template <int AUDIO_OUTPUTS, int AUDIO_INPUTS>
struct AudioInterfacePort : audio::Port {
	std::mutex engineMutex;
	std::condition_variable engineCv;
	std::mutex audioMutex;
	std::condition_variable audioCv;
	// Audio thread produces, engine thread consumes
	dsp::DoubleRingBuffer<dsp::Frame<AUDIO_INPUTS>, (1 << 15)> inputBuffer;
	// Audio thread consumes, engine thread produces

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Just download the source for Stoermelder-P1, apply this small change and you’re done.

Squinky · June 11, 2022, 5:51pm

Of course if you are going out to a physical output you better clip, since a lot of them will roll over from max to min when they go over. Which of course sounds totally awful.