Your guess is probably correct. There are a few XSpice based vendors
that have this capability as well. Not that I have been bothered to add
it myself. I would say its a 100:1 ratio of people who are prepared to
write code themselves to solve analogue design problems.
Kevin Aylward
[email protected]
http://www.anasoft.co.uk
SuperSpice, a very affordable Mixed-Mode
Windows Simulator with Schematic Capture,
Waveform Display, FFT's and Filter Design.