Spectrum Extender
System-wide PC Audio Equalizer and Effects app for Windows 7 to 11
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#138 Spectrum Extender
Is it possible to implement Spectrum Extender? The one Vipper4Android have in its options
Its meant to improve lossy low quality files
Here some implementation
https://github.com/AndroidAudioMods/ViPERFX_RE/blob/rewrite-continued/src/viper/effects/SpectrumExtend.cpp
I guess this is something that must be implemented in Equalizer APO of which I'm not the developer. Unfortunately, the developer of Equalizer APO isn't very active on his project so a spectrum extender isn't going to be implemented soon.
On the other hand, if it's possible to use the current Equalizer APO to create such a spectrum extender then it can be implemented in Peace. Unfortunately, I don't know how to do this. And looking at the source code of ViperFx_RE it seems difficult to do with the current Equalizer APO commands.