Thanks, Dave. Doing the research now. BRO is useless for such things. They have a Vanhal disk on GP that is equally interesting, but also only says 'piano'... 
Well, the BRO order arrived yesterday and now listening to the
Hoffmeister recordings below (I've re-attached the reviews and included one on the clarinet sonatas). Concerning
Biliana Tzinlikova in the solo keyboard works, the booklets simply state 'Piano', although the pics included have her next to a modern piano - the sound of the instrument certainly is modern, but she plays in a more classical mode w/ little use of the pedals to my ears. Interestingly, she is on the faculty at the University Mozarteum in Salzburg (
LINK), so likely quite use to performing on different keyboard instruments; the works on her first two CDs are all from the 1790s, thus 'why not use' a fortepiano? An email address is listed in that link - could send her a brief note (have been pretty lucky in getting responses from artists)?
The 2-CD set of
Clarinet/Piano Sonatas is well done (the attached review is actually of two competing recordings coming out at a similar time - unusual for this accelerated interest in Franz Anton?) - Claudia Bracco plays a Steinway piano; Luigi Magistrelli performs on 3 different clarinets (C, B Flat, & A - mostly on the C), from the first half of the 20th century, i.e. 1916, 1930, & 1956 - SO, if the music is of interest to you, not period instruments. Happy 'hunting' @ BRO! Dave
