To put a time reference to this, here's a response from Peter Q. back in Jan 2001:
>Posted by Peter Qvortrup, Audio Note UK Ltd. on January 01, 2001 at 03:52:15:
>In Reply to: Re: Cap answer: Audio Note vs Jensen copper foil paper in oil posted by
>mobile homeless on December 07, 2000 at 00:20:47:
>Sorry only saw your post today during my routine scan.
>I think it is worthwhile to note that the Jensen paper in oil caps were a development
>between myself and Tobias Jensens old designer, we spent two years making caps from
>different materials, various winding techniques and connections, this lead to the caps
>you have, which I believe are copper foils.
>Jensen is an industrial capacitor manufacturer, they never made caps for audio signals
>before they started working with me.
>Just so you know.
>I hope your New Years celebrations passed as well as mine!
Also, FYI - Steve at Angela Instruments last purchased PIO caps from Audio Note in 1996, so this is really a very out-of-date observation, unless he still has some 9+ year old caps to sell, in which case, the comments would apply to those caps only, not any of the Audio Note caps being sold anywhere else here in the 21st century.