I had one and used it for several years till I took it apart (still
have it) It has very nice audio. Mine at least is has dual function.
It uses TE compensation by attaching to pitot tube. You would need to
disable this connection if you use TE probe (preferable mode). Each
Rico Vario came with its own (small) bottle and another (half the
volume) for TE compensation. I do not think connecting it in-line with
mechanical vario and large bottle would work very well.

My only issue with the vario was that it would freeze up in high
altitude wave flight. There is just not enough power delivered to the
thermistors to keep them within measurement range at very cold
ambients. Other than that I think you'll love it.

Cheers,
Henryk Birecki

wrote:

With my new glider, I got a box of extra equipment. Included was a
never-used Rico audio vario, still in the box, but without
documentation. It checks out good. But does anyone have any info on
these varios?

Specifically:

What size capacity bottle should be used with this?

What are the functions of the large and small dials? Trim?

What is the performance of this Rico? My glider has a nice Scheumann CVA averaging mechanical vario, but no audio. Is the Rico worth installing?