This recording breaks new ground for me.  I used a natural sound input with a microphone, the striking of a small bell, via the Blacet Input module.  I used the Modcan CV Recorder as a low-fidelity audio recorder to make three tracks of different strikes of the bell.  I then played these in reverse at a much lower rate.  The result is filtered through the dual MOTM-480 VCF in low pass mode.  The long crescendo in each cycle is the inverse natural envelope of the bell!  The bright ring at the start of each cycle is created by MOTM-800 envelope generators triggered by the Modcan CV recorder and operating on the filter.