  Ongoing improvements of sub-mm- and mm-range interferometers and single-dish
radiotelescopes are progressively allowing the detailed study of planetary
nebulae (PNe) in molecular species other than 12CO and 13CO. We are
implementing a new set of tables for extending the capabilities of the
morpho-kinematical modelling tool SHAPE+shapemol, so radiative transfer in
molecular species beyond 12CO and 13CO, namely C17O, C18O, HCN, HNC, CS, SiO,
HCO+, and N2H+, are enabled under the Large Velocity Gradient approximation
with the ease of use of SHAPE. We present preliminary results on the
simultaneous analysis of a plethora of IRAM-30m and HERSCHEL/HIFI spectra, and
NOEMA maps of different species in the pre-PN nebula M~1-92, which show
interesting features such as a previously undetected pair of polar, turbulent,
high-temperature blobs, or a 17O/18O isotopic ratio of 1.7, which indicates the
AGB should have turned C-rich, as opposed to the apparent nature of its O-rich
nebula.
