Lionel said:

OK. Thanks TD, Bruce, Marc and Robert.
I have some reading to do again!

"Marc & Robert" ?
Do you know this good LP from Rita Mitsuko ?

http://www.ritamitsouko.org/Marc%20et%20Robert.htm

Nope, but though my French is lacking, this title I liked:
"Tongue Dance" :-)

--
Sander deWaal
"SOA of a KT88? Sufficient."