Synthesist Roberto Raineri-Seith shared these videos, comparing the Moog 907A Fixed Filter Bank to a modern clone, the Mos-Lab Fixed Filter Bank 914.
The above video demonstrates the Moog 907A Fixed Filter Bank (with inductors) from a System 15. The second video, below, demos the Mos-Lab Fixed Filter Bank 914.
Both filters are demonstrated with 2 Moog 921b oscillators from a System 15 (32′ and 16′ rectangular waves), with the same arpeggio and audio setting.
Like this,currently building a YuSynth DIY, 914 clone.The arpeggio on the demo is a good way of demonstrating the filter in action.Hope my module ends up sounding this good.