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Level difference between Airplay and SpotifyConnect
#1
I have a Pi4 plugged into an RME ADI-2 DAC.  I have normalization off, and all of the starting volumes in moOde set to 100%.

When I Airplay from Spotify, the RME input meter peaks at around -.5dB as expected.  When I send the same songs to moode via SpotifyConnect, the DAC's input meter is pegged at "OVER" and I swear I hear a hint of clipping.

RME has special WAV files to verify bit-perfect, untouched playback.  Moode passes that test when I play them via Airplay, so there seems to be something different about the SpotifyConnect side.

Ideas?
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#2
It's prolly due to differences in how the Airplay and Spotify renderers handle volume. All moOde does when a renderer is activated is set ALSA volume to 0dB (100%) and then step out of the way.
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#3
Spotify has settings for general volume (normal, loud, very loud) and normalisation. Don't know if this is applied at playback via renderer. But you can test.
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