How to check audio from TE

Tracktion Engine
1

Hi all,

I have a strange issue. In my JUCE/TE project if I go the AudioDeviceManager windows (the classic from JUCE) and I click test I ear audio and I can also see audio coming from the inputs.

But when I add a clips (midi or audio) to the edit I ear nothing and I don’t see the mixer moving.

What I’m missing? There is something to do to match the JUCE audio device to the edit?

Before it was working but then it stops and I don’t find the problem :frowning:

Another point is that is working on my windows dev PC but not on the raspberry with HiFi Berry.

But on the raspberry if I do some test via command line I can ear sound!

Thanks in advance!

2

Without showing your code, nobody will know whats going on. What is about the demo projects? Does it works?

3

@baramgb you are right sorry.

Basically I have this in my App.cpp

App::App(tracktion::Engine& engineRef)
    : engine(engineRef)
{
    App::instance = this;

    auto& dm = engine.getDeviceManager();

    dm.initialise();
    dm.rescanWaveDeviceList();
    dm.rescanMidiDeviceList();

    auto& juceDM = dm.deviceManager;

#if JUCE_LINUX
    juceDM.setCurrentAudioDeviceType("ALSA", true);
#endif

    auto result = juceDM.initialiseWithDefaultDevices(/*ins*/0, /*outs*/2);
    if (result.isNotEmpty())
    {
        juce::Logger::writeToLog("MINBOOT: FAILED initialiseWithDefaultDevices: " + result);
    }
    else
    {
        if (auto* dev = juceDM.getCurrentAudioDevice())
        {
            juce::Logger::writeToLog("JUCE DEV OK: " + dev->getName()
                + " type=" + juceDM.getCurrentAudioDeviceType()
                + " sr=" + juce::String(dev->getCurrentSampleRate(), 0)
                + " bs=" + juce::String(dev->getCurrentBufferSizeSamples())
                + " outs=" + juce::String(dev->getOutputChannelNames().size())
                + " ins=" + juce::String(dev->getInputChannelNames().size()));
        }
        else
        {
            juce::Logger::writeToLog("JUCE DEV NULL after init");
        }
    }
...

And I see this:

Log started: 4 Feb 2026 12:11:19pm

Logger enabled
Audio block size: 64  Rate: 48000
JUCE DEV OK: default type=ALSA sr=44100 bs=512 outs=256 ins=0
[4 Feb 2026 12:11:22pm] TRACKTION outputs: num=1
[4 Feb 2026 12:11:22pm] Track 'Track 1' outDeviceID=(default audio output)
[4 Feb 2026 12:11:22pm] Track 'Track 2' outDeviceID=(default audio output)
[4 Feb 2026 12:11:22pm] Track 'Track 3' outDeviceID=(default audio output)
[4 Feb 2026 12:11:22pm] Track 'Track 4' outDeviceID=(default audio output)
[4 Feb 2026 12:11:22pm] Track 'Track 5' outDeviceID=(default audio output)
[4 Feb 2026 12:11:22pm] Track 'Track 6' outDeviceID=(default audio output)
[4 Feb 2026 12:11:22pm] Track 'Track 7' outDeviceID=(default audio output)
[4 Feb 2026 12:11:22pm] Track 'Track 8' outDeviceID=(default audio output)
[4 Feb 2026 12:11:22pm] Track 'Track 9' outDeviceID=(default audio output)
device=default activeOut=11
outputs num=1

And If I go in the audio panel created by default from juce with the test button I ear sound correcty.

In the Demo of TE I can ear audio so I’m confused :frowning:

Thanks

4

At the end I copied the Settings.xml from the DemoRunner and now it works again!

5

I guess you should not manage the device manager. The engine is handle the device manager. So if you load the settings of the demo, you repair the device manager. :wink: Have a look at GitHub - debrisapron/tracktion-engine-hello-world: A super-simple JUCE/tracktion_engine app which nevertheless makes a sound

6

So you mean no deviceManager activation on the start of the app?

7

That’s handled by the Engine constructor.