connecting a TALSpeexDecompressor output to a TALAudioMixer input at runtime

[fisherman]

What do I have to do to connect a TALSpeexDecompressor output pin to a TALAudioMixer input pin in code?

I can successfully connect a TALWavePlayer output pin to a TALAudioMixer input pin in code.

playerWave.OutputPin.Connect(mixer.InputPins[0]);

Connecting a TALAudioMixer output pin to a TALAudioOut input pin works also.

mixer.OutputPin.Connect(audioOut.InputPin);

But I am trying the whole day now to connect a TALSpeexDecompressor output pin to a TALAudioMixer input pin in code. But there is no signal. Please note: There is a channel and an input in the mixer available for connecting. Connecting the same two components visually at design time works fine, so the audio format settings should be fine.