I see that the continuation of this series has been announced on MDT (and I presume on Toccata Classics also.) Haven't heard the first volume yet (intend to)- glad there's a 2nd one of course! (Two quartets on this one, Op.49 no.1 in C minor and Op.48 no.3 in E-flat, possibly published ca.1809.)
Yeah it's on Toccata's website as well.
Very much enjoy Vol. 1 (and I'm not even huge on SQ music) and looking quite forward to vol. 2...and the rest of the series.