Improve time stretching quality
At the moment the quality of time stretched audio clips is better with WSOLA than with rubberband when I use a factor of 1.5.
Since modern version of librubberband have a v3 API the quality can be increased. It's a bit confusing that – for example in Debian Bookworm – the lib is called librubberband2 with version 3.1.2 and the actual library is called librubberband.so.2.2.1. But there are 2 CLI tools: rubberband and rubberband-r3. So there is alreade the v3 API available.